ECart can be a really useful extension, but to get it to work well, a bit of php (and database) knowledge can really help.
There are some great books on php, (but I'm sure that's not what you want to hear right now).
I think that's why WA brought out powerstore
All I can suggest is read the guides and the forums, get a feel of the product, and post to the forum.
There are lots of people out there, in Webassist, and others like me, who have been through the steep learning curve before, who are all happy to help.
Good luck with it.