A good sim would be “rFactor” or “LFS”, limitless expansion and cars/track are free and made by mod teams. Also you can try “RACE”, I’ve done some leagues with rFactor and RACE, but I ike rFactor better.
Otherwise try “netkar pro”, the best open wheel sim I’ve plyed and it only was topped by the subscription base “iRacing”, since the developer of netkar pro helped developed iRacing.
What wheel/pedal combo you getting? G27? Fanatec? Frex?