This is a project I wanted to start years ago but never got around to it. Here's some suggestions from my own prior notes and current observations:
First of all I agree with Pes's comment in that the word "training" should not be used in how-to info even if it's referring to teaching specific techniques for mutual increase in enjoyment. It encourages abusive behavior and discolors and misreperesents everything ZETA stands for. They already know how to have sex and training implies you're trying to MAKE them be a sexual partner which is the last thing animals and the zoo community needs more of. This is about courtship,
communicating with the non-human partner that 1. you're available as a mate, 2. how it happens (they may be interested but hesitant because of the differences in anatomy and scents making the concept confusing) and 3. what NOT to do for both of your safety and to keep things secret (i.e., no humping any other human they want) which is mostly an association thing that the human does such as only sex being allowed when the bedroom door is closed and locked, shades are drawn, clothes are off and down on all fours.
Secondly you might have better luck in getting support and contributions if you re-do this post (post again) this time with a different approach. Make this more of a COMMUNITY based project (or make it much more obvious that that's what it and your intent is). You could do things like make the author "by the ZETA zoo community at large" or "by Zooville members" or something else inclusive, and list yourself as something else other than THE author. Your name is the only name on it currently.
You could also maybe offer to include post/comment author references of specific info sources, like usernames and post/comment dates.
Then you can open it up for suggestions and be sure to emphasize this is only the research phase for the first draft. Give members at least a few months from now to contribute before closing the window for text and photo contributions and suggestions.
There's lots of things you can do to make this feel like a genuine community project instead of looking like you're just gathering other people's content and slapping your label on it like indiscriminating zoo porn sites do with other people's homemade content. I know you said it's for organizational purposes, I agree it's important to help make sure essential info gets to readers most of whom who aren't going to read through hundreds of pages of misc comments to find important information not mentioned in the first page or two of comments. That was my intent for this too. But how this is presented and getting the community engaged is equally important for its success in my opinion.
Personally I just want to help make sure people's non-human partners are happy and healthy as new zoos mates. That being said, I and others have recently posted some important comments in the bitchsex how-to thread that were added after your draft was already posted, so that might be worth adding. They're on page 6-7:
https://www.zoovilleforum.net/threads/a-complete-guide-to-bitch-sex.460/page-6
Since this is an evolving subject with new little gems, perspectives, techniques and stuff popping up in posts and comments even to this day, it might be wise to make this an evolving project by starting it out with the version number in the title itself. That will also avoid confusion with readers inside and outside of this website.
Lastly but certainly not least, there really should be ino included for the following things:
Zooromanticism and nonsexual zoophilic bonding (purposes, soecies-specific methods). There's more dimensions to zoosexuality and relationships in the animal kingdom than sex. I feel like the book so far could use more heart and depth, otherwise it just promotes the concept that zoophilia is just all about sex.
Discussing ZETA and its importance.
A brief history of zoophilia (because this can end up anywhere online outside of this site).
That we are all literally "animals" and why it's important especially in a zoophilic relationship to cultivate a develop a greater sense of equality with and empathy for our prospective non-human partners.
What NOT to do (like restraining by physical force or using commands aside from while knotted for safety, and no negative reprimand, only positive reinforcement).
Delving into different forms of zoosexuality to help readers delineate between unhealthy zoosexuality in online content that is abusive or can lead to abuse through neglect by users, kinksters, bestialists and of course zoosadists that are prevalent throughout the internet especially commercially produced zooporn vs the healthy types. In other words, use this as an opportunity to help educate new zoos on how to not support abusive practices in the future!
Some additional ideas:
I think it would possibly also be wise to add into the book intro the recomendation for the reader to make sure they obtain the ebook from its original source to ensure they aren't getting a copy that's been tampered with by antis and trolls or contaminated with maleware by antis, and to also make sure they're getting the most up-to-date version.
You have started something here that has the potential be something helpful and important, and even more than just a basic how-to sex book for Zooville newbies. Because this is a downloadable and shareable thing not permanently anchored to this site, including important information and resources relating to zoophilia in general I think would benefit everyone.
That's all I've got for you off the top of my head. I've got more info in my notes. If what I've said so far sounds good to you, maybe we can collab on this. DM me. I've got more info in my notes and I'll dig them up for you if you're interested.