any good RTS games I can get started off on?
I would recommend Command and Conquer: Tiberium Sun, it was my gateway to strategy games and is really satisfying and still has nice graphics 20 years later due to good art design. You can get it for free these days so at least try it out sometime.
I also started playing Phantom Doctrine recently, really fun if you like the gameplay XCOM has or a cold war espionage setting.