most servos are universal with a 3 pin plug, run the black wire the same as the switch plug, buy a good strong servo for this car or it will die prematurely.
10 kg or more and metal gears...you really should have 2 good one for a buggy, and you need the right spline servo horns also.
with the right size 5 cell rechargable pack you will have the right voltage to run everything.
what you have brought is a full on race buggy, its not designed for serious offroad terrain like a monster truck...bashing around in the dirt is fine though and it wont matter what tyres you get, a bigger block tread will last longer.
you should have got an airfilter with the kit?..make sure you oil it to keep the dust out of your motor.
read up on things like how to run-in the motor so it will last and give good power.
the number pipes and plugs you mention are not anything i've seem before, hot plug for run-in and medium for racing around should be ok... the best pipe for the motor is what dynomite and other owners recomend
the best advice i can give you is go to a track and see how these thing are raced if you havn't already or check out some youtube...alll the info you need is on this site so good luck mate.
Craig