Non just hook up the kits if you are running a wet kit. Colder spark plugs. Autolite 103's. Maybe just a bigger fuel pump. I do suggest a RPM window switch for the N2O tho.
Methanol injection is used as a substitute for race fuel and doesn't make any power just by injecting it into the motor. It just allows you to run more ignition timing than you could just using pump gas, and that is where the extra power comes from. Most people use it for cooling the intake charge over what can be done by the intercooler alone. I use a Snow Performance system on both my SCs.
When using nitrous, you don't really need the methanol because it's already super cold, and you typically have to reduce ignition timing by 2 degrees for every 50 HP.
The only mod you need to do to use the nitrous is make sure you have a big enough fuel pump to support the extra power you will make using nitrous.
I am going to use the meth to cool my overdriven supercharger. But was unsure if I could also run nitrous as well. Thanks for the info you guys are great. I am excited about this now