I did the transmission fluid and filter and oil change and filter last week was spark plugs and pcv valve and headlight restoration did come out great have to redo next week will probably be the serpentine belt and maybe brake pads and rotors

I want to recharge the ac i have read it's the r-134a kind anyone have a how to posted?? Ohh and it's for a 2005 pontiac vibe its my girlfriends... Any help is appreciated