If you want to draw on computers, then get GIMP, a free trial of some other program, or MS paint. The rest is practise.
HTML is coding websites, there are good tutorials at www.w3schools.com. That's where I learned and it's actually run by the World Wde Web Consortium, so it's very accurate. The only other thing you need is a web browser, (which you have,) and a program like Notepad, which you have if you're running Windows.
Flash is a program used to make games, animations, dress-up dolls, and other things. I don't believe there's any free flash program though.