hi,
as a dispatcher u should first of all check if it is a IFR or VFR flight, then see the weather conditions prevailing both at the departure airport and at the destination airport if it is above standard values. also select the alternate airport, calculate fuel, calculate the take off weight , fuel weight and max landing weight. see if u have any NOTAMS issued , prepare a flight plan, obtain over flight permit and landing clearence ,file the flight plan with ATC . brief the crew abt the met conditions and also about the maintainence issues if any.