Hi Neodoxa! Good to have another vaper (or soon to be...) here! I started with a 510, and actually still use it daily... I have an eGo on order. You won't be disappointed with the 510's vapor production, it really rocks... but eventually, the relatively short battery life (depending on your vaping habits) might make you want to upgrade. Don't sweat it or worry about it. The 510 is a solid unit that delivers on 9 of 10 points, and is a GREAT one to start on... if you're really looking to get off analogs and into vaping, well... the 510 did it for me.
The cool thing is... the eGo / Riva types are all 510 compatible... so when you decide you're ready for a little more "oomph" and a lot more battery life, all of your lesser hardware (attys, carts) will transfer over. No starting from square one, eh?
5 packs of carts? if they're 5 packs of 5, you should order some juice to refill them soon. Get lots of small bottles in different flavors to try. I craved that "tobacco" flavor for my first couple of months, so get a few of those, but not *just* 'baccy. Last week I gave away all my tobacco flavors to a friend who just got his first kit.... I honestly just can't stand the taste anymore.
Welcome to the forum and the adventure!
[Hi, my name is Hiram, and I'm a juice junky]