Season 4 will require you to build and live a town together with everyone else. This is a collaborative experience first, so you cannot travel thousands of blocks to make your own private base for you or your friends.
The Community town will be within the rough 500-1000 blocks around spawn. But all community quest builds should be within 100-500 blocks. Keeping everything relatively close together in this regards is important so players may easily take advantage of their unlocks.
When working on quests that require you to build anything, be sure that you are going with a majority opinion with regards to location, style, etc.
There is no such thing as claiming a specific area for your self or your friend group. Yes, you can make your own home and have your own storage. No, you cannot be insular and only play with your friends.
Be sure to communicate your plans with the group via Discord and in-game. Remember, over-communicating is always better than under communicating.
Understand and accept that you will need to make compromises, and not everything that is built will be your idea or your plan.