Dimensions not showing on sketch after inserting them

Have to say that I really hope SW is good when it finally works. But I've been having months of pain and I'm getting no where with it.Why is it this hard??? I was fine with AutoCAD Lt, but this 3D is doing my head in. Nothing seems to be where it should be.  

You helpful guys sorted out for me what to do to see the inputs for the dimensions when doing the inital sketch and I can get them in. But now I find that I cannot see the actual dimension displayed on the dimension line on the sketch. HEEELLLLPPPPPP again, please.

Many thanks.

Bill