Just google DCS A-10c startup checklist and print one or 2 out.
Until you get the hang of it ignore the indicator tests. Keep the list basic to battery, inverter, CDU, CDU Generator etc.
Do the start-up, taxi to runway and quit and start over until you have it down.
An empty multiplayer mission is a good place to practice since you don't have to set anything up.
Good Luck. :thumbup: