Yes that's correct. I'm not familiar with that setup myself but one thing to bear in mind is all tanks have a coil, this is the part that vapourises the liquid and depending on how much you use the device, will need replacing or rebuilding(depending on the type of tank). I'm sure rawwalker666 will help you with that.
as for where to get the liquid from that's up to you pal. The other reason I started vaping is smoking was expensive so I liked buying cheaper liqids(£3 a 10ml bottle) to satisfy my wallet lol.
As suggested though just buy a few 10ml bottles till you find a flavour you like.