in general use LEAN mixture and IDLE throttle in all planes.
Than , in the most you have to activate the fuel first, yes. Excetions so far are :Bf110, G.50 and Br.20 IIRC.
the easiest wuld be to map a key on that function not to have to search the cockpit with your mouse....
in the Spits, Hurris, FIATs and Blenheim to wait till the engine gets some temperature before giving more throttle and mixture is very important, otherwise your engine i quits..
and now something special: the Br20 and Blenheim you have to activate carburetor preheating too , OH YES
map it too a key is my best advice
you dant have to activate the magnetos manually, the "start button" (on whatever key you have it, i strg+I
) is activating them
i have only ONE big proplem: in the Ju88, He111s and Bleheim i am only able to start the left engine !! right engine dont start. Any ideas ??