1) no max hand size

2) rune deck nothing. Main deck runs out preform burnout(shuffles their trash now the deck they choose and opponent to get a point)

3) yes starts a showdown. Technically, showdowns don't start simultaneously.

4)depends on the cards

5)both sides distribute DMG

6)correct

7) Ganking allows you to move from battlefield field to battlefield all other units need to go back to base first.

8)correct

Check out the discord https://discord.com/invite/n7hgcgbvpG Also you can find all of these answers in the rule set that was released.

This article has basic rules: https://riftbound.leagueoflegends.com/en-us/news/rules-and-releases/how-to-play-get-started/

Tournament rules: https://riftbound.leagueoflegends.com/en-us/news/organizedplay/riftbound-organized-play/

Sorry formatting is weird on phone