SOUTHKRYPT'S PROFILE

Hello all. I am new to the site & have been lurking around online for an answer to my question. So far no help has been found. I am hoping someone here can.

I am wanting to make a RPG game based off D&D 2edition in RPG maker Vx ACE.

I am trying to figure out how to create forumla for the following:
To Hit(Thaco)
Damage per Weapon type(1d8,1d10,1d12,1d4)
Damage would need to be random like rolling the dice. Taking into count Att bonus, weapon bonus(+1 - +5) depending on weapon,

Also Armor with range from 10 to -10. (-10 being the best AC) and Thaco will need to be calculated accordingly. Any help please