I think I immediately started building a TDM on my server, that was really nice, for a new guy.
Not on my server:
I was on Tape's City server... And had some troubles with DannyBoy's Bullpup, Rocket Launcher, as well as large store.
But that was after I started multi player. I did some stuff in single player. I can remember my rookie mistake in the kitchen. I had build a crappy base on the fridge, hid ontop of the light, blew it up with a Rocket L, then tried to run over to it and take pictures or to save it really quick so that I would have a "Wrecked base."
Another thing I did was Bedroom night, and I built basically some sand bags, a jeep, and a few tanks on the other side of the map, and "Parachuted" (Used jets) to get from the ceiling down to the floor, tried to shoot the crap out of tanks, etc. I did a few other things too, so yeah. I was basically a "Toy soldier" on block land for the first weekend I played, because I was still at the age of planning tactics and setting up Army men strategically in my basement o.O