remove the engine first and get an engine stand makes access a million times easier for starters!
then take loads of pictures as your removing bits, label everything (i just use masking tape and pencil and put nuts and bolts in labelled jiffy bags) its worth getting a Haynes manual for torque settings especially for head bolts when you come to reassemble it
it all depends on how far you want to go with the rebuild, are you just looking to replace all the gaskets, or just head work (valve guides, skimmed head, port/polish) or the entire engine i.e. bearings, piston rings and ancillaries?
Haynes will give you plenty of information, and the beauty of taking pictures when you get stuck you can always revert back to them or post them on here someone's usually bound to know what it is (providing you've got a decent camera)