I don't think anyone has mentioned so far that you must keep the same 3 obstacles through every round. Also, the debris obstacles from the Huge ships (the big tokens) are not legal for non-Epic games.
In terms of general advice, just make sure to check you have everything you'll need. Tokens (especially the "special" ones like extra munitions or bomb tokens), bases and stands (for both small and large bases), etc. Also rule upgrade cards like tractor beams, and special rules found only in booklets like the Ghost's docking/undocking.
Edited by Dasharr