Remember to clean your heads every couple of tanks when they start to taste funky. Soak them in alcohol for 10 mnts or so then rinse with water. Towel off the excess water from the wicks and do a dry burn (3-5 second bursts)until the coils glow and the gunk is gone. They will last much longer. I would also get an evod or mini protank. Heads are cheap and easy to rebuild, saving you money in the long run.
I agree with BigBen2k, find a few videos on youtube and watch them for device specific hints.