Hey, sorry for the delay in posting, i saw this question the other day but was too busy with my car to take the time to reply...
There is no one stop shop for manual conversions. its a part together your self kinda thing.
first of all what car do you have? this only partly matters because of the clutch pedal, I'm assuming you have a car that comes stock with a 1uz so sc ls or gs, if you have an sc this is easy, get a clutch pedal from a manual sc and i think the supra one works as well. the other cars you might have to get creative a little bit. to get the pedal to bolt in...
aside from that this is the list of parts you will need...
Transmission - W85 and R154 are the most common
Flywheel - Superrunner on this forum sells a modified stock Toyota truck flywheel that works best, others have used modified mr2 flywheels but there harder to modify and not the safest option.
Clutch - this heavily depends on the flywheel and transmission combo you use, I'm using the superrunner flywheel and a W58, so I'm using a stock application non turbo 3rd gen supra clutch, although i had to re drill my flywheel for the clutch.
Adaptor - There are a few people who make adaptors for various transmission, mine was made by Phil Bradshaw, i forgot his contact info at the moment but people around here know it. there are others that make adaptors for the R154 and V160 some company's in Australia make complete bell housings but it seems to me they are much harder to get your hands on as the company's don't seem to work well over the Internet.
Slave Cyl - I'm using a Howe Chevy style slave cyl that is sold at summit racing part number 82870
http://store.summitracing.com/partdetail.asp?autofilter=1∂=HRE-82870&N=700+115&autoview=sku
a few cars you might need to change the brake booster for a smaller one as it would interfere with the clutch master cyl placement although i don't know what cars have this problem off hand.
I feel im missing something but oh well someone will chime in or ill rember and post later..
heres a few pics of my 1uz, w58, superrunner flywheel, clutch, howe slave ect.....