I think I'm gonna start less than that, I know you pick up some pounds for every inch past 28 and I shoot a 31" draw on my compound so I figured I might be best to buy a 25 or 30lb bow to get started.
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As a rule of thumb (never exact but usually close), you will gain 2.5# to 3# in draw weight for every inch above or below the marked draw weight.
Example: the bow is marked 50# @ 28"
If you draw 31", you would be pulling about 57.5# to 59#.
Do keep in mind that the longer you draw, the longer bow you will need. Again, there are many different designs so call the Bowyer or Manufacture for guidelines on their bow. I draw 31 3/4" (monkey arms) and I could get by with a 62" bow but a 64" bow is much better. You can usually take a 60" bow up to 30" or so. Again, there are forward handle and many other designs that change this but it is a good rule of thumb.
I cannot agree more with the start low and build up. It will greatly improve your learning curve. Another huge recommendation is to get in touch with Tom Clum at RMS gear. (They are in Colorado but he can help through the web and video.) Best thing I ever did was spend $$$ on an archery clinic that was here in TX. My form, consistancy and accuracy have all improved.
Start off right and do not hurt your shoulders. Many have much success for years and then have to rebuild their shoulders due to improper form.
Now that I have all that hot air out of me, enjoy it! It is the most frustrating and enjoyable thing in the world! I started a couple of years ago and have sold my compound since then. I enjoy getting close and not getting a shot opportunity with my longbow more than getting a harvest with a rifle. That said, if I get invited to an open area, I still grab the rifle from time to time.