TRIPPY-CHORDS'S PROFILE

Hello all, first post and first game I've ever made. It's kind of like Zork mixed with D&D. You can level up stats, get spells, potions, bunch of other stuff but I can't seem to figure out a decent balanced scalable battle formula. The current formula for the player attacks are as follows.

Heavy attack (cuts the players speed in half): (weapon_base_attack + (weapon_max_attack * strength)) / enemy_defense

Light Attack (cuts damage in half): (weapon_base_attack + (weapon_max_attack *strength) / enemy_defense) / 2

Here is the enemy attack formula
(base_attack + (max_attack * strength) * level) / player_defense

I don't think any of this would end up actually working out very well. This is the first formula I've ever made so bare with me. I truly have no idea how to go about making formulas so I'm lost. This is the last piece of mechanics I need before being able to alpha test.
I made a heavy and light attack so the player has to use a bit of strategy and it's boring to hit for the same damage every time
Do you have any suggestion on how to make these formulas? I'm sorry if this is a stupid question but as I said I'm completely new and really don't understand how to make fair and balanced formulas.
Also, should I allow the player to have more than one stat point (to level a stat) every time they level up?
Any help would be beyond appreciated.