I too was having vast problems and was pointed here:
Start with Admin and work down!
It's kinda hard to follow unless you have 2 browser windows open and follow step by step with ISPConfig and the docs side by side...this worked for me yet I'm still a pain in the butt here asking all sorts of questions...but that is how I learn! Also don't be afraid to pitch in if you think you can help others, Till and falko really put in a lot of time and can use the extra help from us all!
Also, You don't have to create a reseller to add websites...you can set them up as the admin! This had me a little stumped until I was again pointed in the right direction!