Here's a list of things to keep in mind while searching for the perfect publisher for your book. You're welcome to print this out to use when you're ready.
1. The main genre of your book
2. The audience
3. How long has the publisher been in service?
4. Is their reputation good or bad?
5. How do they pay their authors? Royalties, Advance, both
6. Have you talked to the other authors published by them?
7. How do they distribute the books?
8. Will book stores stock their books?
9. Have you checked their guidelines? Do you meet them?
10. Send query first, one publisher at a time. Write down name of publisher and date--do not send them another email until at least 5 weeks have passed (this might also be in their guidelines). If you can, keep all rejections so you don't forget you've sent the query or manuscript to them already unless they have specified they'd like to give you a second chance after things are changed (it does happen)
11. Do they help market their authors? If so, what do they do?
12. Is there a charge for anything? You should never pay a publisher to accept your work--it should always be the other way around!
13. How do they pay their authors? What type of percentage if getting royalties and how often? (Goes with #5)
14. Have they had complaints from other authors? If so, why?
15. Look at their covers from other books they have published. How do they compare to other companies? Is it of good quality?
16. What types of books do they publish? E-book, paperback, hardcover, all the above?
The importance of each question is up to you. Some things weigh more than others, depending on what you're looking for in a publisher. You know what you're capable of as a writer. The rest you can learn but weigh its importance before signing any contract. If you have questions about a contract, ask someone before signing it. Not all lawyers are able to assist, if you want one to look over your contract make sure it is a lawyer who specializes in contracts for writers. They are out there. Have fun but be careful!