Here are the essentials to cutting your fabric for a quilt:
Of course, if you want a cutting ruler that isn't broken in several places, it will work, too. ;0)
I have tried doing it without these things and I DON'T recommend it!
Some people recommend washing and ironing your fabric before you cut- I definitely recommend ironing, but I don't wash the fabric. I don't really have too much of a reason, other than I am lazy.
Once you have all your supplies and fabric-- have at it! If you have a pattern- cut as directed. If you don't have a pattern- have fun! Some of my favorite quilts are made without a specific pattern.
And that's about it. Last little tidbit to leave you with-- the more accurate your cutting, the easier the sewing and quilting.