Just be aware of that if you have cartridges, those are the hardest of all options to make work correctly as a new user.
So if you are having a lot of problems with them, make sure to come here for help.
Although you will get a lot of suggestions on ways to get them working...
The best advice you'll get will be to buy some cartomizers.
When you say Ego Tank system, do you mean an Ego-T model?