There are some good kits out now. Lot's cheaper than when I started. There wasn't much choice back then. I guess the ego 510 is a good place to start. 18-24 is good advice. Another piece of advice start out with a bunch of sample sized juices. It always takes a while to find your flavors. No sense in spending a bunch on juice that ends up collecting dust. Also don't limit yourself to tobacco flavors. You will be surprised by what your taste buds like. For instance I smoke two packs a day of kools for years. I don't care to vape menthol at all.
Another thing is order extra attomizers or caromizers or tanks or whatever it is you decide to go with, in fact try out a few different ones as well. Each person finds their own system that works.
The more info you can give the forum the better people will be able to help you. Like what is your budget, do you want to to look like a cigarette, are you on the road a lot or far away from electricity, do you spend a lot of time at your computer, etc.
A question like spending time on the computer might seem irrelevant but it's not. They make passthroughs that plug into your USB so you don't need to worry about battery life.
Good luck.