Welcome to the contagious world of reloading. In addition to the manuals, the powder companies also have a lot of useful info, including powder minimum and maximan loads, overall length (OAL), velocity, etc. I know when looking at everything needed to produce a safe bullet it seems overwhelming, be of good cheer, after you have loaded a few it will start feeling natural to you. One other thing. Double check your work. If in doubt at any stage, stop and verify. Good luck and have fun.