I don't know which reloader you used for shotshells, but metallic ammunition is simpler and quicker to reload.
The first stage is very much the same: Deprime and size case. On metallic you have a lube for the cases, most people buy Carbide dies to avoid lube and clean up on pistol cases.
Second stage replace primer and flare case mouth (on a progressive, this is usually where powder is added)
Third stage, the bullet is added. Some loading set ups seat to length and crimp in one step, Some do it in two.
Forth Step; Shoot up ammo and repeat.
It does get more complicated on in, How you prime cases and, How you dispense powder. And this is where you start deciding How Much Money you want to spend!
The absolute least expensive way to make ammo is the slowest: A Lee Loader. About $20 per cartridge and around 50 per hour of reloading. Many of us older loaders started here, and keep these loaders for the rest of our lives as a back up system. "So simple. A caveman could do it!" All you add are components, a hammer, and a place to sit (floor or sturdy bench)
Next up in expense are threaded dies and a single stage press. A basic starter kit will have all the small tools you need to make one cartridge of ammo, and then all you will need to add for additional cartridges are a set of dies and maybe a shell holder. This is where prices get FUZZY! These kits can be so simple you will want to replace/upgrade equipment right away, or much more expensive so you will be set for the rest of your life. The big variables are Quality of press, the quality of scale, and the quality of powder measure. And to some degree the quality of loading manual. You can experience a couple of hundred dollar difference.
Loading manuals are very important! Lyman's loading manual and one by a bullet company (Sierra, Hornady, or Speer) would be good to start with.
Lots of reading and comparing are on you list of things to do.
You can spend even bigger money and buy progressive presses and end up at 500 to 600 rounds per hour and add several hundred dollars of cost.
The fun is in the learning, and the using of ammo you made. If you don't shoot 300-500 rounds a month, stick to the less complex kits/systems or you will have a slower time recovering your investment. I've been loading for 41 years and have a room full of equipment, I make ammo that cannot be bought anywhere! I own multiple systems of reloading, so I can say with some authority; Start simple, and enjoy the process! Buy the best pieces of major equipment you can afford (press, scale, and powder measure) and you can use them the rest of your life, clear through your grandkids lives!(Cheap is usually short lived!)
Ivan