The basic Attributes are Strength(In raw terms how much force can be output, Weight threshold), Dexterity(Sleight of Hand, Reflexes, Sprint speed), Constitution(Metabolism, Immunity, Toughness, Luck), Intellect(Learning, Insight), Wisdom(Perception, Talent), Charisma(Persuasion, Performance)
The complex Attributes are as follows Attack Damage Modifier, Defense Modifier, Mental Power, Ability Power, Magic Energy, Speed, Initiative, Skill Modifier, Magic Modifier. To be Simplified.
How will a character walk around if they have low strength? They can always just walk but that will still tire them out faster. Stamina is Strength mod + Dex Mod + Con x level.
Example is every 3 of a number in a basic attribute gain +1 to the modifier. The modifier starts at -3 when at 1 to 2 in that stat. When you get to 3 it lessens the modifier negative to -2. The average for a human is 9 or 12 in a physical stat.
How will a character run if they cannot pace their steps? Speed is Dexterity + strength mod x level. Example is If Dex is at 9 add an average of 12 strength mod so +1 say level is 3 9 + (1 x 3) = 12 you can move 12 at full speed and 6 at normal speed. Each square on a encounter map counts as taking 1 speed to move onto it otherr terrain types vary.