1: how do you resolve a tie roll when two players are tring to place on the same line, lets say player A places on 5 with 76 points and player B places on 3 with 54 and player c rolls a 54 and wants to place on line 4, player C is placing after player B so I figure they are not kicked off the line because a player did not place a tie or higher roll under them on a smaller numbered line.
You assume correctly. No player is kicked off in your scenerio. A player can only be kicked off if someone places dice below theirs with a value that is equal or higher than theirs.
2: I two players reach the finish in the same turn is it a tie or does the player who rolled first win because they move first?
The player who moved their first wins.