CRJ is not centerline thrust. CRJ has nothing to with T-38, jet "type ratings" are "type" specific... which is why they're called "type ratings".
Best way to fly a T-38 is to join the air force.
In fact many military planes do not even have an FAA type rating... someone who wants to fly one outside of military opcon will need an LOA, which will require ground and flight training similar to a type rating. Your friend should know about that though...
Also... if you have to ask these questions, no way are you getting insured to solo in a T-38, unless your friend is fabulously wealthy and self-insured.
You can probably go for a ride in a T-38 with no training, other than what insurance requires for the ejection seat.