Hi! Welcome to the simutrans community, the forum, and the community of netgamers!
There is no newbie server per se, but please feel free to play on any of the servers, mine included. Chat can be accessed through the message center icon in the top menu. Just type in the top box of the dialog, and press enter.
If you are still learning the mechanics of the game, it is good to play a couple of games offline, but most netgamers will be happy to give you some pointers. I know I have learned a lot by just watching others play.
Feel free to ask me any questions you may have. In game, I operate under the handle RF&P. Happy Gaming!