The best option is get a job to pay you in Bicoin ( or get freelance jobs to pay you in Bitcoin - http://www.reddit.com/r/Jobs4Bitcoins/ , http://coinality.com/ ., https://www.xbtfreelancer.com/index.php ... ), Signature campaigns here ...
The second is buy Bitcoins.
And if you have time to study ... Trade
Wow! this is really a good share in this forum, I have heard many people are offering to pay you bitcoin to do job for them online, this is a good opportunity to gets some bitcoin really because you are doing jobs that you can related too, and I think we don't need to be very reliable in signature campaign alone right, explore and give experience in all bitcoin earning source and I am taking a further step in trading now, and now that I have seen your post I have an idea right now!