What you need is a clear plan. So why not start of small and get your skills better? Make something simple, start of with some mods, then work up to bigger ones then get MCC or NWE (I suggest NWE) then see how it works, and work your way up. Making a game engine is hard, not impossible but hard, lots of stuff to consider, learn, understand and make. So why not work and customise an game engine like NWE completely to suit your needs and work with something which provides a base like that. If you want something even less, so like a skeleton use Panther courtesy of our own Sniko an awesome guy, I'm sure if you nicely asked him he would gladly help.