Welcome to vaping! (and the planet)
You'll enjoy yourself, vaping is good times.
Slow down though vaping, like life, is meant to be savoured.
Once you have a starter kit, play with it a while, try out some different juices and see what you like. Yes there's a whole new world out there, but it'll still be there next week, and the week after that (ignore the doommongers who think that it'll be banned for now, they're probably wrong)
If your eGo is set to one voltage then the next big step forward is variable voltage, this lets you change the power which greatly improves the vape that you get.
There are 748937284973289478923 different VV mods and batteries out there. For my money Innokin make the best mid priced mods going, check out the itaste VV v3 the SVD and the MVP on youtube and on other websites
If you already have variable voltage then hold on a while and experiment more with juice first.
Coils last 2 weeks on average. Some last less and some last more, a lot depends on the juice you're using and what settings you vape at. Though look up "dry burning" and do that every other tank full to get the best life out of your coils.