The pump stuff is far cheaper, and I find easier to use, than the aerosol.
Top tip (not mine so no credit sought), put the pump bottle in a bowl of hot water before spraying as it will thin the ACF50 and it will go on a lot easier.
Just get the bike well clean and dry, spray a fine mist of ACF50 over anything that isn't your brakes, wipe off any excess and spread the oil so you have a thin film on everything but no runs, pools, or globules as these will bake into a nasty tacky spot. Once you're happy everything is covered in a super thin film then I like to fire the bike up for a few minutes and 'cure' the coating (it will smoke a bit and smell lovely). You're then good to go. Cleaning products like Muc Off shouldn't remove the ACF50 for a good few months but any type of degreaser will.