I am needing alot of help!!!

I am placing a system in my car -
alpine pdx 1.1000 - 120 amps
alpine pdx 1.150 - 40 amp i beilieve
alpine f450 - 40 amp

I want to make sure that i make the right steps to supply everything and not have to worry about stuaff breaking

Should i get a high power alternator more batteries or am i fine? i have no clue,
PLUS!!! If i do get an alternator, who makes one for an 06 HHR? this is killing me please help!!!!

at least change out your battery to a yellow top optima
Sams wholesale club had them cheaper than anyone that i have seen, around $130