It is not recommended to be in hurry but focus on other activities anyway.
You must unlock side missions on your own since only few of them are given to you automatically.
The premises of such missions vary.
Caution - After receiving a mission check its briefing in character journal.
Because of that, while exploring the world you should watch your mini-map not to miss them.
Those tasks has various objectives.
You might need to escort a survivor or save a civilian, which hide from zombies in a closet.
Caution - if you fail a small task you won’t be able to retry it.
Don’t worry though, since later in the game a similar one might activate.
Caution - Some of random meetings with survivors are just short talks.
Challenges aren’t available since the beginning of the game.
You get experience points for completing those challenges.
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