Baby Finches???

i don't like keeping animals who are meant to fly, in captivity...but I'm a HUGE fan of birdies (finches especially.) and so i decided if i got a realll big cage it would be alright. well that was about four years ago. two years ago I realized; "it's just as cruel for the poor birdy not to get any interaction with other birds" so I bought 1 more. and 1more. and 1more! now I have 4 finches, three females and a male...and I realized the other day that the female laid eggs! it was bound to happen, but i still wasn't prepared...I slap myself for not getting all of one to avoid the problem, but here we are and i didn't do it - so what now? My cage is about this big; http://www.windycityparrot.com/Merchant2/graphics/00000001/prevue3155.jpg except maybe a foot bigger width and height and it's wooden, and it has little hay on the bottom,and feed, and i put in a little attatchable nest thign...so I just want to know, what to be prepared for? what should i buy for the eggs? THANKS!