This is the deal. I'm new to the game. I'm starting a

web site design company (http://www.webdesigningcompany.net)

from scratch.
I know how to design websites. I'm good with all of the necessary programs to design them.......dreamweaver, photoshop, flash, ect...
What I need help with is understanding how hosting companies work.
What my question is.....
When I start designing websites for people I want to be able to host the site for them (well, kind of, I don't want to go out and buy servers).
What I envisioned was me paying a FLAT RATE hosting fee that gives me tons of space for new sites that I add.
That way I can charge whatever I want for hosting, and the new client would pay me.......
I pay the hosting company, and everybody is happy.....