I am not familiar with the Hornady system (seems like a good one).
The following link will bring you to a page with videos showing how to set up the dies in the press you are planning to buy.
https://www.hornady.com/inst_video_mr.php#
As far as powder goes, Bullseye has been around for a long long time and there is information on it for all pistol calibers.
Reload all the calibers you have. A set of dies is an investment that will outlive you and save you money over the long run even at only 200 rounds a month.
Since you already have the brass some bullets, powder and primers are all you need.
I use AA#5 a lot along with Bullseye and Unique
((.38-.357-9mm.-.44Mag.-.45ACP and .45GAP)) as well as Trail Boss for Cowboy Action loads in .38Spl and .357Mag.
Once you have your reloading manual you can choose a powder that will cover most of your needs.
Order your primers NOW--- You will need
Large pistol primers for the .
45ACP unless you are shooting .45GAP (Glock Auto Pistol) which uses Small Pistol Primers.
Small pistol primers for the .38Spl. Check your manual for the .357Magnum loads as some recommend Small Pistol Magnum primers for some loads.
Bosco