Good suggestions thus far, definitely do not listen to just one source. It's best to read more and then base on what you find on multiple sources. There are abundant of places with information on starting a reseller business. From forums, to guides....
If you are on the fence if you should start reselling, the only way to know for sure if it is for you is to actually try it out. You can find some pretty good offers online that are very cost effective and won't break the bank.
I know for myself, I started in the online world in the 90's by 2001 had gotten really into it and enjoyed what I had done so far and started playing with a reseller account. Used it primarily to learn and hosted just some friends to gain some experience. By 2003, was actually doing it as a business and by 2006 finally jumped full in as a web hosting company.
So basically...you don't know till you try!
If you are worried about dealing with customers, you have to understand no matter what line of work you decide to do. You will always have to be dealing with customers who need help, have questions, etc.
I'm a firm believer that the most satisified people (work wise) are the people who do things they enjoy. So that is where the you don't know till you try comes back in lol
Hope that helps, good luck!