Howdy
First, before you buy anything, buy a good reloading manual and read it. A lot of your questions will be answered off the bat. I recommend the Lyman Pistol and Revolver Handbook, but there are plenty of other good manuals out there too. Speer, Lee, and the regular Lyman manual come to mind. Each of these has a section detailing the process of reloading, that's what you need to read to begin to get familiar with reloading. Do this before you spend any money at all on equipment.
And don't be surprised when you find out that primers are currently just as difficult to obtain as loaded ammo.