Hope some of this helps:
1) You need a cut sheet on *exactly* what is being installed well before you set start work (now wouldn't hurt).
2) You need an actual GC *not* an owner acting as one
(this is the one that will come back to bite you in the butt)
3) The chain stores have their own PM's to act as GC's
(most are ok but that 1 in 10...)
4) Here the restaurant equip dealer or the cabinet shop guy will often act as GC (almost as bad as the company PM but far better than the owner)
As to your (actual) amperage question:
It depends.
Will the donut shop have gas fryers/ovens/etc or electric?
Similar with the hvac equip.
Is a house panel planned (lighting/exterior/signs)?
Even with all gas for everything I wouldn't expect/plan for less than the provision of a 200A service to every operation in the place. Service&Fuel/C-Store/Donut/House
