oil pump

you gotta take the sump off and then the oil pump, clean out the oil pickup then submerge the pickup in oil (I normally half fill the sump with fresh oil to do this) then pour oil in the top of the pump and spin the pump shaft till it flows out the top of the pump. quickly bolt the pump back on then the sump with the oil still in it!
do this with the engine in place as trying to do it while the engine is hanging off a crane will result in oil everywhere, as it wont be hanging straight. Learnt that the hard way

Course you could try filling it with oil and turning it over on the starter motor for up to a minute, you never know it might be ok. If oil light doesnt go out sump off time!
Gearbox you simply turn engine over to TDC, bolt on a new clutch, fit yopur old flywheel so TDC punch mark is at the top, bolt on box, job done.
I'd recommend you replace the input shaft seal, pushrod bush and the pushrod seal on the gearbox though, or at least check the pushrod for play. Pushrod is the metal thing that sticks out of the splined bit in middle of gearbox belhousing when you lift clutch lever
