I don't know if this is the right section to post this topic.
Is there a legitimate way to trade, invest or grow your bitcoins. I have 500mBtc just stck in my wallet and I don't plan to spend for awhile and I was wondering if it's possible to turn it into some form of income?
Yes you are in the right section. By trading what do you mean by that?Trding fiat to btc or btc to other altcoins? Either way you can get a profit if you know how to trade. There is a lot of threads similar to the question on how to earn with trading. If you roam around the forum I'm pretty sure you can find some helpful threads.
As for exchanges or where you can start trading hou can view them here:
https://bitcointalk.org/index.php?board=223.0There you can find almos all exchanges available.
If you are interested to know more about alt coins here is the
Announcement board ( you will see all alt coins both new and old ones in here),
Altcoin Marketplace ( I here you will see multiple ways of getting altcoins for free by joining events or bounties, there are also trading threads in here for some coins that is not yet listed on any exchanges.) ,
Altcoin Discussion( you can see specualtions and other market related discussion here about altcoins).
I hope this may help you. If you have more question, feel free to ask away.