1. 16-17 cm from middle finger to wrist, 9 cm from thumb to edge
2. I go with palm grip
3. I usually play a game called Pangya (it doesn't use the mouse hardly at all), Minecraft, and I'm going to buy and play Overwatch with my new PC. Other than that, I don't know what games I will play.
4. I am thinking of going more competitive but not overly competitive on Overwatch.
5. $40-80 USD
I hope this helps.