Borrow any AD&D book, it'll tell you everything you need to know. I'll answer these two; the 75 is a strength bonus only applicable to fighters meaning you get higher to hit and damage bonuses. THAC0 means 'To Hit: Armour Class 0'. In other words, it's the die roll you need to get as a minimum to hit someone with an AC of 0. If your THAC0 is 5 and you're fighting an orc with platemail and a helm that gives him an AC of 2, you'd need to roll a 5 - 2 = 3 to hit him. If you were fighting a troll with a natural AC of -4, you'd need to roll a 5 + 4 = 9 to hit him. Not too hard to understand. Additionally if you roll a 20 you get a critical hit, and if you roll a 1 you get a critical miss.
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