No matter what language you choose, my suggestion is that you have a project. So that when you've learned a it of the language, you start trying to develop a programme to do something. The fact that you want to complete the programme you're making can help with motivation, and it's just cool to be able to do something. Of course, whatever your project is, it probably won't end up as a good app, cause too much of it is written by a really novice programmer, but it's still kinda fun.