I haven't tried the tanks so can't comment there, but DO try the cartomisers - I use them in a DCT (Dual Coil Tank) and they give a brilliant vape, much better than any clearomiser AFAIK.
Try not to be despondent - there is so much kit out there, and so many different combinations, let alone so many types, strengths and mixes of juice, that it will take you time to settle on the preferred delivery method, strength of juice and flavour. Stick with the process, and please ask if you have any problems - we have all been where you are now, and can help you to get the best from your kit and your wallet!
Andy