1st- wander until level 8 so you can make a scrap door. Wooden doors are shit. Put a codelock down too.
2nd- Build hidden. Rocks, coves, etc. Don't build near big bases, don't build in the open.
3rd- Use stashes. Don't put all your valuables in there, but put essentials- tools, resources, etc.
4th- Box in your Tool Cupboard. Wall it off completely. If someone gets in your base, they can't take it over.
5th- Air locks. You should have to get through 2 doors to get in your base.
6th- Put your bag OUTSIDE your base at first. That way, nobody will destroy it if you're raided.
7th- Wood walls are terrible. Upgrade that shit.
8th- Get on when others aren't mornings. At 7:00 there's hardly anyone on and monuments are empty. I use this time to go to monuments.
9th- Don't build directly near roads and monuments. Have a path to at least one monument, but building near is a death wish.
10th- If you're going to roam, start with nothing and gather as you go. You can have full burlap, wooden armor, plenty of arrows and a bow, along with whatever you hunt on you by the end. Leave your guns for when you need them most. Tomorrow a research kit should be added to let you research weapons you find- save guns for that.
11th- Choose the right server. Big servers are shit- full of hardcore no-lifers. Pick smaller community servers.
12th- Don't kill on sight unless you fear for your life. If you have nothing on you, go up to people. Be friendly if you can.
13th- make friends with your neighbors. "Hey I live around here, I just wanted to let you know Im friendly and we can work out an alliance-" Don't let them know exactly where you live until you trust them. If they kill you on sight, try again. If no matter what you say they kill you, consider moving.
14th- If you want combat, play embankment or battlefield servers. There are plenty of "noob friendly" servers along with ones that give increased gather rate and XP rate.
Follow these steps and enjoy.