Something else you should consider very seriously. Getting ones draw length right is not as easy as just taking a measurement, no matter how you're measured. Sometimes the charts just don't quite fit and some tinkering is involved; something you find out over time. Therefore I highly recommend that you buy a bow that is adjustable for draw length. Some bows come with cams that are draw length specific and this you definitely do not want right now.

And when you look at bows you'll find that there is a sticker on the bottom limb that usually states the poundage range and draw length. Do not accept this as being right as most bows do not really draw what they are marked. Most are too long. Ask the shop to actually measure the bow you are looking at.

Another thing is to pay attention to whether the cam(s) are straight. Too many these days are crooked (called cam lean). Do not accept a bow with cam lean. Make them straighten it out before you pay for it. Actually a good shop should do this routinely. This should also be an indication of whther you are dealing with good people who know their stuff. Accept no BS in these matters.

I wouldn't get too concerned about arrow length at this point. You're going to a shop and if they have their ducks in a row they should be able to set you up with regards to arrow length and spine