Do not spend $200 - 300 on an RotV Master Set. Watch the sales & trades subforum here, and you'll find one, and other goodies, at a reasonable price.
It's a great game. There really is no substitute, and you'll find your way in.
As for the C3V and SoV customs, I know it's intimidating. Just ask your particular questions here, and we'll help you as best we can. Or, come to think of it,
[edit incoming] you can ask all your C3V/SoV questions
here.