Explore. See the world for yourself and try to make your own choices. If the foes are too hard, you've probably went too far, and should check other directions for resources and weapons first.i am kind of noob here what shall i do after i gather some material and crafting some weapons but what shall i do then who to kill or try to find the other survivors?
Explore the crafting system too, see what you can make.
Don't worry, you cannot die in this game. And even if you make mistakes with quests, you can just start the game again. It's actually much easier on second playthrough.
And if you're stuck, there are guides here. John has a big guide, and at the end of it, there are links to more guides:
https://f95zone.to/threads/mad-island-v0-05-steam-e-made.209671/post-13838706
Skaldy's beginner guide might be useful for you:
https://f95zone.to/threads/mad-island-v0-05-steam-e-made.209671/post-13881499