I would suggest you get your draw length measured, start off with low poundage bow and most of all get someone who KNOWS how to set up a bow set you up and paper tune your arrows and then get either a well seasoned archer who can help you with the basics or go to the local shooting range/club or go to an archery pro shop that has people on staff who can help you.
The only reason I say all this is you can either start off shooting with all the information and shoot good, or start off with trial and error and add some poor shooting habits and have unexplainable aiming issues (to you) show up.
I am guessing you will be hunting with your bow, and I have been hunting with a bow and arrow for over 35 years, shooting both indoor target and outdoor 3d for about 20 years. Have had lots of help throughout the years from several talented archers who have asked nothing other than to help.
Buying the bow you can hardly go wrong with any of the nationally known companies out there, longer the length axel to axel and the longer the brace height will give you the forgiving you will need as a new person to archery. 34+++ axel to axel and a 7+++ brace height is better for ease of aiming and shooting.
Good luck, and have FUN !!