1-- read and understand the reloading manuals printed by the major bullet makers These books will have all the info you need, and when reloading keep the distractions out of the loading room, you must pay attention to what you are doing.
2--same as number 1
3--same as number 2.
I have been hand loading for over 40 years and so far have never had a bad round. Did make the mistake of following another fellows recipe for a 7mm STW. Way too hot for my rifle but no blow ups just a stiff bolt. I load several pistol and revolver rounds, 220 swift, various 6mm's, 280's, 7mm mags. All my center fire presses are single stage, KISS. I do have 3 progressive Ponsness Warren progressive loaders and boy you best keep on your toes.
I could write you an encyclopedia on loading but common sense is your friend.
"A man's rights rest in three boxes: the ballot box, the jury box, and the cartridge box"
Where's your scale? Powder measure WITH baffle? You'll want shell blocks, especially when working with the single stage press. One addition I found extremely helpful was the press riser stands from Inline fabrication. Eliminated ALL of the torque on the edge of your bench by mounting the press on top - worth every penny.
And don't forget the bullet puller for those mistakes you're going to make
Case lube. After learning the hard way that Hornady one shot sucked, I moved to Imperial liquid and graphite.