you'll probably have to actually code up the interfacing structure yourself, if you have the VB/VB.net examples this won't be a problem as you'll know roughly what commands take what.
You'll need this
DLL to Lib converter; set it to COM based DLLs and it'll convert them ready for use. Use PE Explorer to find out the symbols and stuff, shouldn't be hard just take a little while to setup
not impossible just not going to be a cake walk ^_^
I'm creating a DBP Engine interface in the same mannor atm to access everything from VC++