As I see, there is big room for you to improve your expansion skill:
How to plan your capital build
How to spot the city site and determine the priority
How to timing the worker/settler build
How to use the slavery efficiently
All those things happen before T100, they are the fundamental CIV skills, but can be mastered in a couple games if you try to think and test. Playing too many games won't help much. Listen to everyone's suggestions but don't blindly follow, believe in yourself through tests, that why I mentioned to your about calculating the total yields.
Hmm..thanks! Will definitely be bearing all of these in mind! I guess this game was a bit sub optimal/really sub optimal, however, I do think it is far from lost at least.
But I've been playing starts here and there on deity to improve my beginning which I suck at

I think calculating the yields may be a bit tricky for me


