In my opinion, there are many ways to start bitcoin. It can be trading, mining or simply come to this forum and join some campaign. I can't give you the exact because the third one is the thing that I do. In trading of course, you exchange bitcoin to the others while mining needs computer to do and lot of electricity because it needs to work everyday. And the only thing I do, just join some campaign maybe signature campaign or bounty campaign. So far that's all I know.