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what do i have to do in loading a pe exe to memory

AFIAK, the best source of information about loading executables is the book Linkers and Loaders; an early version of which can be found online.

Details of the PE format itself can be gotten from Microsoft's website. A more basic overview can be found on MSDN.

You may want to read reply #6 in this thread first, for a quick explanation of the principles of relocatable file formats. HTH.

so all i have to do is load the exe to the preferred base address and jump to the entry point?

if it doesn't have unresolved links, yes ... otherwise, you might also need to load DLLs first and link the EXE with those DLLs ...

is there anyway to know if there are unresolved links?

In the kernel: There won't be unresolved links, unless you wanted there to be.

In applications: The import directory (see the PE format spec) tells you which DLLs the application references, and which functions it wants in those DLLs.

So:
For each DLL in the import directory
Load the DLL
For each function imported from that DLL
Look up the export from the DLL
Put a pointer to the export into the import address table
End For
End For