Holsters
You can probably find a lot of info on holster types if you search here in the forum search tool or online in general. Since you are relatively new to pistols though, I think you should know that the recent trend of completely kydex Appendix Inside the Waist Band (AIWB) is relatively new. Not to say that appendix carry itself is new, but it has become the latest trend, with lots of youtube gun gurus choosing it for speed of draw.
There are pros and cons, just like any carry position or holster type.
I believe there *is* utility for having a holster before you have a CCW permit. It can serve as a protective sheath as you transport, unless you are going to carry the case with you everywhere. On an outdoor range, it makes it a lot safer to be able to secure your pistol in a holster rather than laying your firearm on the ground or leaving way behind you on a table next to strangers as you go change your target.
If you search holsters, you will probably find kydex holsters first. There are lots of small time sellers on Amazon or Ebay. Know that kydex isn't exactly chosen because the material is unconditionally the best or most comfortable. It's because it's cheap and just about anyone can make one. It's low maintenance too. You heat up the kydex in an oven, press it between 2 foam sheets, rivet it together, install chicago screws, install the hardware, smooth the edges, done. Can just anyone make a great kydex holster? No, but the average first time buyer won't be able to tell the difference. The 2 sheets of kydex (or Boltaron) are inexpensive, something like 12 dollars if I remember. Kydex isn't particularly soft or flexible against your skin. But it's low maintenance.
When I bought my first belt holster (as opposed to pocket carry), hybrid holsters were gaining popularity. The back is leather, the front is Kydex so it "snaps" into place, but is soft against you.
And I'm sure way before those it was all leather which is still popular and probably the classiest option. So for you I'd eventually look into what position (strong side outside the waistband seems to be what Blackhawk! does most), then what material. The larger the pistol, the more likely an outside waistband strong side holster will be comfortable.