First, I hope you not trying to use your personal computer for mining at the same time. That's a bad idea for sure.
Check how much power your PSU has. it seems like you don’t have enough power when it’s all on. Buying some cards it's not enough, there is a lot of work and knowledge which you should have.

Why don't you try to install it yourself HiveOS or samplemining. You will find enough tutorials on how to setup your mining rig with them, also all settings you will do through the dashboard panel.