The istick is a great chose for your mod, but I would suggest getting the istick 30W instead. Even though you probably won't need the extra wattage starting out, it's a big improvement otherwise over the 20W so now it'll last longer. Worth the few extra bucks.
For a tank, that's a bit more complicated. The easy cheap and reliable answer is a Eleaf GS Air M. I've gotten a few friends setup with this combo when starting out and they are happy with it. You'll also find a pretty avid group of people on here that swear by it.
It's a great inexpensive way to get your feet wet before trying other tanks that are a bit more complicated or costly.