1) Judging from https://en.bitcoin.it/wiki/Avalon , you need quite a bit more hardware to integrate the ASICs into a mining rig, which should be done ASAP, because the continuously rising difficulty level means that every day your rig would be able to mine slower. So option 1 is to buy the needed hardware, assemble, and start mining bitcoins. I don’t really have an estimate of how many bitcoins that rig could start mining, but you should be able to find out before you buy the hardware. There are youtube links for setting it up. A google search for “avalon asic setup” should get you started.
2) You could try to auction off the ASICs on Ebay or the like.
A quick look at Ebay suggests that the bare ASICs sell for about $10 to $20 each. So it looks like your 48 ASICs are worth less that $1000 - probably closer to $500.