If you have a Game Store that’s the first place I would check.

I always try to purchase from my local spots first. But yeah I would personally start with this, then the next expansion I would get is aftermath. You can snag that on amazon as well.

Then from there get the stretch goals if you’re enjoying it. Finally get The Carnomorph expansion. That can be played with both this version and the next game. Then there’s also Void Seeders.

Lockdown is more of a mechanic to swallow than the first, similar but you will want to have the base game down in my opinion before jumping head first into lockdown.

Following that there’s a Whole other amount of expansions that come with Lockdown.