Checking the players on a team?

How would I do that?

for _, player in pairs(game.Players:GetPlayers()) do
	if player.TeamColor == BrickColor.new("color of the team you want") then
		-- do the things you want with player
	end
end

If you're trying to get all the players on a given team, you'd do something like this-

function getTeamPlayers( teamColor )
	local team = {}
	local teamColor = type(teamColor) == "string" and BrickColor.new(teamColor) or teamColor
	for _, plr in pairs( Game:GetService("Players"):GetPlayers() ) do
		if plr.TeamColor == teamColor then
			table.insert(team, plr)
		end
	end
	return team
end

local team = getTeamPlayers("Bright blue")
-- or 
local team2 = getTeamPlayers(BrickColor.new("Bright red"))
-- will also work :)