Holy moly! That WAS fast!
Go to buy a cage and find it FULLY stocked eh?
I too think you have your work cut out for you..but take it sloow and be very patient and you will reap the rewards of loving budgies

Mind if I ask a few questions?
How big is the cage they are in?
Just how long is long when you say their beaks and nails are long?
I ask this because overgrown beaks can cause serious health issues if they get so long they can't eat properly. And nails? They can get caught up in things and cause foot/toe problems if they are so long that the foot doesn't sit properly.
You probably should get some cement/oyster shell perches to help with keeping things trimmed. Like these
http://www.petco.com/product/106805/PETCO-16-Cement-Perches.aspxIf beak and nails are ALREADY too long a trim by an avian vet may be needed.
Sorry to say that if you don't want breeding and babies, you will have to cage them separately afterall.

I know it sucks..but it is what it is with male/female pairs.
Are you SURE you have a male and female? Did the previous owner mention anything about egglaying or breeding in the past?
Annnyway..Congrats on your new friends
Take it slow...even where naming them is concerned. LOL A name will pop in to your head eventually once you get to know them and their personalities a little better

Pics would be niiice *hint hint LOL (I couldn't view the pic with that link either

)
Open and account at photobucket.com
Upload some pics and copy/paste the IMG code here in your post

Might even help us determine gender and whether or not you have a nail and beak issue going on there