Mate, insist that you join the 24th Foot, and that they don't need to train you as you know tactics. And stuff. Give them an example, such as the classical attack in the shape of a fighting bull buffalo, with the head, the horns, and the loins. First the head moves forward and the enemy naturally moves in to meet it - but it's only a feint. The warriors in the head then disperse to form the encircling horns, and the enemy is drawn in on the loins, and the horns close in on the back and sides.
You are obviously not suited for the Intelligence Corps. You have looked at the situation and realising that you don't have the information you need you have rightly asked for assistance. These traits are totally foriegn to the Int Corpswho will never admit that they don't have all the answers.
Seriously though read up on all the Corps and Regts and all the trades offered, then think about what you want from your time in and what you will do when you leave and then make a list of your top choices before commiting yourself. Best of luck.