1)My first question is do I roll all the dice for the 3 soldiers and divide up the damage on the 2 commandos how I wish?
Roll all the dice. Distribute the damage among the commandos as you like, except that you have to apply damage to a different commando if the other cannot take any more damage (i.e. already has 3 wounds)
See rule book p.12 bottom right)
During my next action phase I killed the 2 soldiers on my tile
2)Do I automatically become stealthy?
3)Or Would I have to kill the soldier in the next tile to be stealthy again?
4)Or would I have to kill the soldier and do a move into the small tile with no soldiers to become stealthy?
You can only become stealthy by
a) moving to a small tile that has no enemies on it (rule book p.4 and p.5 top left)
b) moving stealthily to a medium tile that has no enemies on it (rule book p.4 and p.5 top left)
c) putting on a German uniform on a tile where there are no enemies. (rule book p.19. bottom right)
The designer answered the whole thing with stealth and visibility in another thread:
(https://www.boardgamegeek.com/thread/1682542/becoming-stealt... half way down the page)
Your stealthy / visible status changes every time you move onto a tile.
Commando doing a "moving" action onto small tile become stealthy.
Commando doing a "moving" action onto medium tile becomes visible.
Commando doing a "stealthy move onto medium tile" action onto medium tile becomes stealthy.
Commando doing a "moving" action onto large tile becomes visible.
If there is an enemy unit on the destination tile, 2 options:
Commando was stealthy before entering the tile: he must perform a stealth check.
Commando was visible before entering the tile: he is visible when he enters onto the tile (the enemy sees him coming) + reaction fire from each enemy unit on destination tile.