hi,
For a biz-jet company you will most likey be a jack of all trades, arranging everything from fuel and gnd handling to flight plans ad overflight clearances and perhaps even the bossman's(or bosslady) newpapers and transport between hotel and aircraft. Depending on where you work you may have to prepare the flight paperwork and put together an airfield brief depending on your area of operation. Bizjets will go quite often go where airliners cannot so familiarity with your jepps or aerrads is important for those tricky little places with shorter runways.
You tend to deal with demanding people where delays are not an option and cancellations dont exist, flexibility is the key and emphasize your attention to the little details. Good organisation skills and the ability to think fast are important traits in any ops but especially in bizjet ops as they tend not to have the extra help on hand that you'll find with the airlines.
Good luck