1)My name is mang. I am glad to cooperate with you.
Намайг Манг гэдэг. Та бүхэнтэй хамтран ажиллах болсондоо таатай байна.
2) Please actively participate in team matches and do not timeout as much as possible.
What do you mean by "team matches"?
Did you mean: Please actively participate in team activities. Please do not take a timeout as much as possible. If yes, then the translation would be:
Багийнхаа ажиллагаанд идэвхтэй оролцохыг хүсье. Мөн амрах цаг аль болох авахгүй байхыг хүсье.