Yes, CSS server will need a HeLL member to start the mix. CSGO is fully automatic as soon as teams are ready. Teamspeak IP: ts3.hellclan.co.uk:17297 While you in community servers your not allowed in Teamspeak. Only in Mix and other games.
Maybe this is not the right place to ask but can you randomly join a mix or you need a pre-invitation since most of them have an even amount of players in every team ?