Do I have to accept all the people who sign up for my quest?
No. It's your quest. You can accept who you want. You may also modify your quest in anyway, just as long as you keep to the site rules. If people are found to be fighting over things like this on your thread they will recieve warnings and your thread may be permanently locked if it all gets too bad. (Or we find out you were the cause...)
Hey, I can be another animal in this quest! Is it mine to keep if I fill in the form to be one?
Sorry, but no. You MAY add other animals to your quests if you wish, but the players who sign up to be that animal will own that animal ONLY in your quest. They will not be moved to the archives, they will not be yours to roleplay in other areas.
If you have any other questions your confused about, post them in this thread and Ill try to answer them! :3