well you can do it the long way(suggested) or the quik way
but for starters, buy a mhg(metal headgasket) and some arp head studs...for when ur head gasket pops
the long way is:
rip motor out, disassemble completely, new/better pistons,rods,bearings,
basically build it ground up
same as any motor
just make sure to buy that headgasket first
short way, bolt ons....plain nd simple haha
new turbo, turbo manifold, intake, injectors, lexus afm(or supra sport afm)
walboro fuel pump, and a rear spoiler that 6ft high
personally id go the long route because then you know the motor will handle the power you want to throw at it
hope this helps