Calling functions externally

I understand what I'm asking is much easier done with DLL injection, however I wanted to try something new.

Okay, so I'm trying to call functions externally (hence the thread title). If I understand correctly, I can accomplish this with CreateRemoteThread. However I don't know how to exactly do this.

Here's what i'm thinking:

• In our host process, we create a function that we will inject into the target process
  
• Inside that function will contain our instructions that declare and assign to where the function we want to call now that we are inside the target address space.

Does anyone have an example code that does something similar to this?

1. find the function you want to call (address)
2. createremotethread with that address
3. ???
4. profit!