I'm Lucy, and I'd be happy to answer your questions today.
There are hundreds of publishers out there, the trick is to find one that's reputable. A good place to check out any editors you find is www.pred-ed.com, which can help you get an idea if they're legitimate. If you want one of the big US publishers, you can look for an agent first. Agents are also listed on that website, but you can also find agents who represent the type of book you write on www.agentqueryconnect.com or www.querytracker.com.
For either a small press or an agent, you'll need a query letter. This site is an excellent resource for finding out how to do that.
Did you have any other questions about this?