I keep hearing about this sale... How much are we talking about? I'm clueless... I generally don't partake in community goals or anything beyond simple stuff like USS hunting or trading. Feels like a huge thing to get into these community events and find info about them in-game....
Its a 15% discount on all Faulcon Delacy ships:
http://elite-dangerous.wikia.com/wiki/Faulcon_DeLacy
Only in Zaonce system.
For future this thread does community goal updates:
https://forums.frontier.co.uk/showthread.php?t=113495
Edit: OP: If you're very careful you can trade without insurance but you have been warned and any "I lost my ship and am back to sidewinder" thread will be responded to with general laughter and amusement.
I'd recommend solo until you have re-buy cost although its rare to be interdicted if you're in python. Try to find a quiet system with as few players as possible and trade goods with high profit margins. (Sell in High demand, buy in High supply).
Check on the commodities market which item is sold where (it will say on the right something like: produced by X, consumed by Y) so you can use the system map to plot trade routes and hopefully make profits.
Note: Just because something costs 9000 per ton does not mean that it makes more profit. Check the comparison between the galactic average. The more different it is the more profit you make.