You've gotten two very valuable pieces of advice - use an ohm's law calculator to determine what power your coil will be delivering using a mech and decide whether that's a good range for you, and make sure you aren't using a hybrid-style mech (or be very sure your 510 pin protrudes sufficiently and is locked in place). Most of the "exploding e-cig" stories I've seen lately are from people using tanks with hybrid mechs, so I just don't recommend them at all, especially for new users.
Also, make sure that the power draw your coil will create is within the continuous amperage rating of whatever battery you use - and that your battery is made by a supplier honest enough to publish their continuous rating - that means Samsung, LG, or Sony (but there are lots of Sony fakes floating around). Good luck!