You can really start with whatever draw weight you want....but not if you want to shoot 100 arrows a day. Back in the '80's, when I started, the thought was that a man in good health should be able to handle a 65# bow. So maybe if you wanted to work up to it, you could start with maybe 55-60#. So we shot however many arrows we could out of our 55-60# bows, maybe 10-15 arrows a day. Eventually, I learned to hunt with my 65# Black Widow, which I took my first deer with, and still have.
That is just to put things in perspective. Today we have gone in the other direction, and I do most of my target shooting with a 40# bow. But the point is, I'm sure you can learn to shoot fine with a bow that you draw to 45#, just not at 100 arrows a day, but probably a lot more than 10-15. And I think you will learn a lot more about archery shooting 30 good arrows a day than you would if you flung 100 carelessly.