Usually its best to ship both basses on the same day during a trade, and send tracking information on the day of shipment. I have had good trade deals that way. Of course, Local is also the best way to trade
It's going to be a tough deal to trade with someone who has Zero feedback and requires that they receive a bass before shipping theirs out. But hey - your Stingray is looking pretty nice! And I think if you provide the trader with your EBay seller ID it would help them to see your recent sales history.
I have had amazing experiences with the TB community - it's a great place to deal. Good luck with the trade.