Subaru my car

So I have a 2003 Subaru legacy 2.5l
automatic and I found me a 2.0 twin turbo d
and 5 speed Manuel transmission, and I am
wanting to put the twin turbo d and 5 speed
Manuel transmission in it what do I need to
do to get my car ready and prepped to go it's
a 2003 twin turbo d motor comes with a 5
speed Manuel transmission and me and a
friend are going to do it it s a jdm motor and
transmission, my buddy told me I will need
to find an ecu, for it and differential /
drivetrain, for it so it's more beefier, so I don't
snap drive terrains. But the twin turboed
motor doesn't come with drive terrains or
ecu. Will some one please break down what
steps I need to take as far as what basically
detailed I need to do as far as the swap and
I want to run it like a Toyota Supra we're the
smaller turbo spools up the bigger turbo.
And so what side would I put the smaller
turbo on what side of the car. Basically I
need the whole run down as far as detailed
as possible and will I have enough room in
my engine bay to fit the motor and
transmission swap detailed as possible
please and remember as of right know my
car is an automatic and I want to turn it into
a Manuel so I am guessing i will need a
hydraulic clutch, ecu to run the motor and
transmission, and need  drive terrains, and
need enough room to make this project work
please right me back a.s.a.p. thank u yet
again please right me back soon I am saving
up to do this swap and I want it done right
were can I look to see were to get the right
drive terrains, ecu, and parts to make this
project work thanks again sincerely yours,
dustin