Advice, tips, speculation please.
I think that you should hold on to them for a moment because buying Bitcoin is already an investment in it self so I think that you should not do much with them.
Wait for the price to rise and then make a choice if you want to sell some of them.
Sell some of them if you need money or else better choice to save them or invest them in trading, both are the good ways to make money in long run, you should take decision that best fits your needs.
Actually if you still have money aside from 12 BTC you have, just consider that amount as for investment only, chances are you can grow that amount if you are strictly managing it for investment purpose only. As an investor, we should understand that we cannot mix our personal expenses and for investment by nature business is separate and distinct from the owner.