Thank you for the replies! I haven't actually sent it and I'm cleaning up some mistakes I've made so far. Should I also focus on finding writers as beta readers or will my friends be ok?
your friends should have a fair grasp of sentence construction, so they may be good proofreaders.
they may also be good as readers, or horrible...impossible to say from here.
as far as "readers or writers" it can be good to have both, depending on the beta. A good writer beta should be able to act as both, but some can't and are too likely to be bogged down by minutae. They may be excellent proofreaders and great and finding bad metaphors, etc., but with minimal overview, for example. there really is no flat "yes" or "no" to this.
btw, regarding the lists, I'm not a list guy, but I'd keep it fairly minimal. too many questions, and they are less likely to really think about each one, as well as perhaps to beta again.