manual transmission

[frostburn]

i am doing a conversion and i think i ran into a problem... i have the manual tranny and nothings in it the clutch and presure plate and all is out of it... theres no fluid in it... but the gears wont shift... the shifter moves left and right but not up and down... i was told it may be that the transmission sat for to long and i have to beat the hell out of it so it will start moving right again? should i just put the clutch and everything in it fill it with fluid and slap it in my car? and hope for the best? or should i have some serious questions about it? ... also... i went to my local canadian tire and i asked them what type of fluids i needed for it and they told me 80W90 gear oil... if thats wrong can someone please let me know i just spent alot of money on all this and i dont want anything to happen to it.... ( conversion + HKS metal head gasket and APR head studs almost completed )