Trying Buriedbornes.

I'm liking it, and the game is just my style, but i'm having trouble understanding many of the details.

Like, i have used attacks that have 60 accuracy but barely ever miss.
All skills say "Damage is based on DEX/INT/ecc", but I have no way of knowing how strong they actually are.
I actually have no idea what my stats are, i only know what my equipment gives me.
How should i know whether a 100 power Int skill or a 150 power Dex skill is better for my int-based character?

Also, what do the colors of the room mean? there are sometimes little dots in the rooms, but i have no idea what they do.

Also, I see a few different maps I can try, which ones should I do?

For reference, i've played three times, reaching I believe floor 13 at best. Ninjutsu is insane.