KVM to OpenVZ, again

Hello, I've read lots of posts and guides but still isn't clear to me how can I do the following:

1- I'd like to make a installation of a Linux OS from zero, i.e., install CentOS 6.5 minimal. So I do this in a KVM VirtualMachine.
2- Then, I'd like to personalize the new system, i.e., install apache, mysql, etc.
3- Finally, I'd like to use this system as a Template to create other KVM VM or OpenVZ Containers.

I think what I'm trying to achive is quite normal, but I don't know how to proceed for the 3rd point. Any ideas? Suggestions?