Working on a game for my Final major project at college. To get into uni. I'm using C# in unity and I want to make a tank vehicle controller with rotating turret. In third person. Anyone got any suggestions.

Don't use unity.

It's a real bear to use, although admittedly I haven't used the newest version.

It wasn't clear from the OP whether he wanted to do 3D or not, but I would advise going with 2D. 3D modeling and animation is a fine art, and if you don't know how to do it well, you're going to spend far more time making assets than making your game.

For 2D development, I don't have a better suggestion if you're stuck on c#, but I had a pretty easy time with Cocos2d using c++, and I'm by no means a c++ expert. It's also free, it's got a huge user base and tons of resources, and it's still actively developed on Github.

If you are using c# and don't want to use unity, check out monogame/xna. It really shines in 2d games.