Ok, i was wondering if i get a Dedicated server and setup VPS on it. would it be possable to offer BOTH VPS and Shared Hosting on that same box? say by setting up a virtual server and running VPS optimized WHM on it?
You can. Just keep in mind that your server is not an endless pool in which you can just pour more and more customers. I.e. watch for the resource utilization and add more servers to distribute the load when things start to grow.
Yes that is possible to offer shared hosting and virtual private servers off the same dedicated server i do that i have one vps for shared hosting and i sell vps's from my dedicated server. Just make sure you don't oversell otherwise the overall performance will drop drastically.