Most any of the manuals give a pretty good rundown. If you have a certain brand of bullets you intend to use primarily I would get that manual to start with.
You should look at the different kits available and see what fits your budget. You will want a digital scale. If you do much for quantity you might also want to get a case polisher. With the 300 you will need something to trim cases, also for the .44 if you want them uniform in length for crimping purposes though not too m any worry about that.
I have a new copy of the last speer manual that was thrown in with an order from somewhere, a freebie. If you want it send me your address via PM.
