Newbie needs guidance

Hello all. I am a newbie! My wife has an off-line skin care business that I decided to bring on-line. It has been a great education so-far, but I feel like I am entering a black hole that I won't be able to navigate: css, html, plugins working with theme's and wp...

I guess what I am asking is where do I go from here?
My next goal is to start up a shopping cart maybe it shouldn't be...
any suggestions would be appreciated.

mahinaskin.com