Hello! Sorry for such a late reply, I was away for a vacation ; v ;
I started doing digital painting around 2006 or so! As for tips, I know it's been said countless times but practice is pretty much a given; though one piece of advice I can give when starting out is to perhaps look at artists you really look up to and analyze their art style and then try and emulate it, I've always found it helpful that-- even when you aren't able to do so, you'll learn a lot from it ^^ ;
So yep! Practice hard!