Imo these are completely different prospects, especially for pre-baiting, and I'd approach them completely differently.
On such a small water (1 1/2 acres) I'd be looking to bait very small spots, very accurately. On bigger waters I'd be trying to get them visiting an area frequently. On waters as small as an acre they're already in the area so I'd be trying to get them feeding regularly on the exact spot I intend to hook them from.
On any water I find frequency is more important than qty. Half a kilo 3 times a week is much more effective than one big dump once a week imo. You don't need to use anything special - any half decent baits will do the job. I tend to use a good food bait and bulk it out with something else (what that something else is will depend on what's in the lake (for example I'd avoid pellet and corn if tench are going to smash the lot)). I tend to stick to boilies and tigers if tench are about.
Pick the right spot(s). Try to find an area the fish like to visit regularly regardless of pre-baiting.
Try to keep it quiet. Pre-baiting is no good if others are fishing your spots when you're not there.
Have fun.