If possible, look for a couple of good trees that are in thicker woods. They'll have to compete for sunlight that way, and will grow longer trunk sections before having limbs sprouting.
Look for minimum bark twist, or "barber poling", that way the stave doesn't propeller and twist as much when you're splitting it. A clear, clean six foot trunk section is optimum for bows.
I prefer 12-16" diameter trees if I have a choice, but I'm happy to get whatever size that I can handle. Try for staves that are three inches wide across the bark. When you're splitting the log out for staves, use a thin axe like an Eastwing, or as thin a wedge as you can find, to start your splits. Some bowyers grind a "starter wedge" down just for that purpose, then alternate regular wedges down the length of the log, using your axe to gently clear interlocking grain and splinters.
If you try starting your split with a fat wedge, you can lose teeth when it bounces back toward your face.
As soon as you have a stack of staves, use some type of sealant on the ends. I prefer wood glue. That will keep the staves from end splitting, or "checking" as it's known. Find a place to stack them out of the weather and sun, with good air circulation.
A word to the wise. Keep them off the ground. Wood borers will eat them alive and ruin your hard work.