Ctrl+J will swing out the jetway if you are parked as per "real" at the gate. Iirc, FSX matches aircraft exit 1 and guides the jetway to it, regardless of the aircraft involved (it will stretch quite a way). Real fun watching the jetway sink into the apron with low slung aircraft, for some reason they did a great job with the jetway extension, but kept the superstructure at a fixed height.
Shift+F will place a call for a fuel truck if the airport supports it (otherwise it's the old FS9 looking around for the fuel box at unfamiliar airports). When the truck arrives it'll call up the fuel weight panel, unfortunately you have to specify the amounts of fuel for each tank (I always seem to get a glitch were 100% fuel load is overfull).
Baggage carts etc are airfield detail dependent. Above a certain detail level, you get attendant baggage loaders, carts. Just a matter of opening the hold doors, either Shift+E then 2, or Shift+E then 3, and they'll come scurrying, baggage conveyor first, then cart. A realism breaker though is on high aircraft the baggage conveyor can end up vertical. AFAIK there are no catering vans, stairs.
i already got all the other stuuf fuel truck..baggage car etc ...but no matter how i park the plane the jet way still wont connect ive tried connecting it with all doors open/closed parking break on/off engines on off...etc...so is there some key thing i need to do that i am missing?