Young padwell, I could crack a joke about being a steward/mortar troop etc but I wont.Actually, starting at the bottom, not as an officer.
Do not look down upon the lower ranks, they are the reason every other rank exists. Have fun at Uni, shag and drink like a film star whilst you're there but do you honestly have time to get a decent degree, work part time to help fund your degree and commit to the TA?
You obviously have no desire to be a member of the TA long term, your intentions are however honorable but why take up a much needed slot for someone who'll be an asset to the TA once they have finished training? You'll just use that training slot for your own ends before you join the Regs. Join a gym and march up and down in your own time. Better still join the Rugby club.
Now, if you really want the old and bold to give you some advice young thruster, start posting some piccies of them student chicks.