Ok let's start off with recommended reading. I think we would all suggest the traditional Bowyers Bible serious. There are volumes 1-4, but volume 1 or vols. 1-2 will give you a good start and will address selecting bow wood, drying, tillering the bow, bows from board lumber, and other topics.
For a first bow I would recommend you make a board (lumber) bow, or a backed lumber bow.
If you want to make a backed bow I would recommend a backing of hickory, and a core (belly) wood of osage if possible. If osage lumber is not available or within your budget, I would recommend Ipe if you can get it. If not, then I would make a hickory backed hickory bow.
You could also start most simply with a hickory board bow. Hickory with good straight grain can make a very solid bow.
There are a number of good board bow build alongs on the net you can find. I'm on iPad so posting links is a pain, but perhaps others wil have those resources handy. Also you can search and find them easily.
Board bows can be made from red oak, white oak, hard maple, ash, or hickory as well as some other woods, but those are probably the most common.
I recom,end hickory because it has the greatest tension strength and I think is a better wood to start with personally.
You could make a bow from a stave (a section of a split log of 6' length) but unless it's perfectly straight without and twist or wiggles, it can be challenging to tiller the bow well enough on your first try.
Hope that helps. Give us some idea what you know and what other information you're looking for .... Hopefully some veterans will chime in with good advice.