How do stats work exactly?

So I just leveled up for the first time. I have 5 points to spend and I am a Mage. So I have played lots of RPGs and generally speaking, you want to have some strength because it increases how much you can carry. Is that also true here? And if so, to what degree? How much does one Str point = in carrying capacity? And also how much does 1 intellegence = for mana or whatever else it effects... I was thinking I would want to focus on intellegence, but I don't want to be the smartest weakling in the game and never have the ability to carry treasures to sell... Also, what is the capacity that you can carry? Is it based on how many slots or is it weight based or both? Also any other general tips or sugesstions etc you can provide about how stats work in this game are very appreciated... And sorry if my post is confusing! Love the game and if I am understanding right, they are planning to make another RPG in the future... I will buy it day one... Only regret is that I just barely found this game this week!