If you stay with the 510 kit, you might get a pack of 5 atomizers - always good to have them around. Ymmv on how you use atomizers up. I haven't lost one due to 'age' (I've killed a few) for over 11 months but that's the exception. Figure on losing one every 3 months - but some go through them in a week.
Batteries - manual batteries (autos can go quickly) will last you a longer time than that atomizers, most likely.
The average around here on ejuice is about 2ml a day (I do 3-4ml/day) but you could figure a 30ml bottle of ejuice a week on the safe side, which you can get at heaven gifts, for example, for $9. OR at other places up to $30. Buy samples:
http://www.e-cigarette-forum.com/fo...-try-lot-flavors-minimal-cost.html#post796633
Find out what you like then stock up. Although your tastes are likely to change. You'll get your taste buds back in about 3-5 weeks. But your taste will change after that too - ejuice gets too sweet, you get tired of the tobacco flavors, and then you'll want something sweeter and go back to tobacco, etc. etc.

Although some will find a few flavors and stay with them. So ymmv on that.