Suggestions for learning good micro at game start

Hi there! I’m fairly new to ranked play but have been playing RTS for quite a while, namely SC2 & some casual AOE II & III vs AI.

What are some good tactics for micro econ in early stages of a game? I’m struggling to get my economy pumping early on (can get some decent numbers but hard time keeping up with the enemy’s econ) and could use some help. I mostly play Britons, Vietnamese, Mayans or Celts. I know Hera has some decent video series for beginners but figured I’d ask the community here as well.

Thanks!!