Welcome to the guild. I had never done any digital work before I joined here myself a few months ago. There are lots of good tutorials but for starters you will need to decide what software you want to use. There is a thread here that goes into some of that. It sort of boils down to a couple things: 1) Price (free - skyhigh) and 2) Artistic talent.
If you are looking for free and have some talent I would say get the Gimp and have a go at some of the tutorials.
Also, take a look at some of the other artists around here and find what styles look good to you and then take a look at what software they are using.
Have fun, I know you will learn a ton and have some frustrations along the way. I still fight with getting what I want into the digital realm but I keep getting better at it so don't give up!