I'm so glad to hear that you've saved those tiny bunnies from a horrible fate!
bunnies do best around 60-72F and deal with cooler temps much better than they do warmer ones, so that temp will be just fine for them.
like I_heart_fraggles said, it's best to lay off the veggies until we can get a general idea of their age. pics, size info (relative to an adult's hand), weight, etc. can all help us figure out their approximate age. hand-picked grass that you're sure hasn't been treated with pesticides/fertilizers is a great thing to feed until you get hay.
there's a lot of info/debate on the *ideal* bunny pellet, you can find that stuff in the health and nutrition section. personally, my favorite is sherwood forest brand because it's all natural -
https://www.naturalrabbitfood.com/sherwood-forest-natural-rabbit-food/ ... oxbow and zupreem are also really good brands. if you just want a temp fix for pellets until you decide which brand is best for you, then pick one out at the store that doesn't have anything in it except plain pellets (no fruits, seeds, nuts or any other colorful bits).
you'll want to determine their genders while we're figuring out age - they may need to be separated now or fairly soon to avoid an "oops" litter! here's a good site on determining gender -
http://www.rabbitnetwork.org/articles/sexing.shtml
even if they're the same gender, if your bunnies are too young to be sexually mature yet it's possible that they'll become hormonal and start fighting later on, meaning they'll have to be separated until/unless you get them fixed (spaying is pretty much vital with females because of their proclivity towards nasty cancers of the reproductive system... with males, it's more of a behavioral thing, plus with either gender it makes it possible for them to have a friend).
for a cage, it's hard to beat NIC cages... though if the babies are very young, they can get their heads stuck in the grids so we'll want to determine age before you decide whether to go that route. at 9 weeks, my lionhead got her head stuck... by 11-12 weeks, she was too big for that. the cages are easy to make and bigger and cheaper than store-bought cages!
here are good how-to sites on cage building:
http://www.guineapigcages.com/cubes.htm
http://breyfamily.net/bunnycage.html
you can also find more info/ask questions in the housing and environment section.
the best deal on grids right now is at sears -
http://www.sears.com/stor-floor-standing-6-cube-storage-unit/p-00913332000P?prdNo=1&blockNo=1&blockType=G1
if you can wait to do site-to-store rather than buying them directly from the store, it's even cheaper (the boxes have 23 grids each)
if you're interested in taking them to a vet to get checked out, beware that not all vets willing to see bunnies are actually rabbit-savvy. we have a great listing of rabbit-savvy vets that can be found here -
http://rabbitsonline.net/view_forum.php?id=9
other great sites/threads to check out as a bunny novice:
http://www.rabbit.org/index.html
especially these two pages:
http://www.rabbit.org/faq/sections/diet.html#babies
http://www.rabbit.org/faq/sections/spay-neuter.html
http://www.3bunnies.org/feeding.htm
http://binkybunny.com/BUNNYINFO/tabid/53/Default.aspx
http://language.rabbitspeak.com/
http://rabbitsonline.net/view_topic.php?id=53690&forum_id=93
http://rabbitsonline.net/view_topic.php?id=75235&forum_id=48
and yeah, I know, I'm throwing a ton of information at you at once, lol! I'm used to answering this sort of thing on yahoo answers and having to get it all crammed into one post
don't hesitate to ask us if you've got any other questions!