Engine Transplant servicing advice

[S13 Silvia]

ok, I'm soon going to be buying a r32 rb20det front cut to transplant into my silvia.

What I want to know is, what do you guys reckon I should do to the engine before I put her in.

I'm thinking

oil (obviously)

coolant (obviously)

gearbox oil

hose clamps and maybe hoses

timing belt?

Also, what is the textbook method for "flushing" the cooling system and lubrication (oil) system?

How involved is it to change the timing belt and re-set the timing properly (I don't want my valve's hitting my piston's )

Also, people have recomended to me that I change all the belts, but I don't think I will because if the power steering, air cond. or alternator stop working, I'll know about it and it won't cause any damage except for the cost of a new belt and/or battery. Is that right? The oil pump and water pump are driven through the timing belt aren't they?