how do I code RTS game?

ok so I want to code my own RTS game like Starcraft or AoE or some other ancient 2D RTS.

I know C/C++ (although I suck at understanding OOP so I will basically just code it in C).  And I have a lot of coding experience at making random shit but have never successfully finished a decent project (mostly from lack of patience but also I suck at structuring my programs correctly so they eventually become hard to manage).

So, how do I learned to stop sucking and figure out how to code something like this properly?

code it in asm for the cool hax [i]my anus[i/]