Since you were just beginning I wasn't going to go too far into the crimping debate. However, let's venture a little deeper.
Applying a full roll crimp(though not excessive) is perfectly fine in a 38 special. That's how it's been done for years. If you are looking for max accuracy, however, that's not the way to do it.
I load semi wadcutters for use on the 50 yard line in Bullseye shooting. I actually seat the crimp groove fully in the case along with half of the forward driving band(the flat above the crimp groove). Then I apply a taper crimp to remove all flaring from the case and just a touch more.
Why? Because on a lightly loaded target level 38 a roll crimp can be detrimental to accuracy. With a fast burning powder it simply isn't needed for combustion at all. I can't explain 100% of the physics behind it but I can tell you that myself and many others have tested it, and it's true.
Now, as a beginner to this cartridge I'm not necessarily advising you go this route but when you feel comfortable enough to experiment with it, I suggest you give it a try.