You'll need a bow press to take tension off the cams and make length adjusments, but you should be able to accurately measure your draw length with a tape measure and order the bow set to the correct length. There are a couple different ways to do it - here is a link to onehttp://www.bowbargains.com/Measuring-Bow-Draw-Length
and another link with some average chartshttp://www.bowproshop.com/measure-draw-length.html
You can also stand in your shooting stance with your fist against a wall and measure from wall to anchor point, but when you are just starting out there are so many variables in your form that you could end up changing your stance a bit and finding you measured an inch off. I'd go with the wingspan divided by 2.5 technique, it is generally verry accurate.
As far as arrows go, you can cut them yourself like has been said, but you need to buy an arrow saw. Any proshop should be able to cut them and set them up for you - and generally do it at no additional charge if you buy the arrows from them.
Good luck man, I'll be starting my first bow season in September with the same bow. I've been shooting with it for a couple months and it has been great so far. Hope it all goes well for you.