You can start with them, making your own line
Get a blank pedigree, might seem like a waste of paper BUT it helped me keep track doing it this way, fill out the buck and does pedigree. The rabbits behind them, cross them all out, so you're pedigree for each will just have their name (for arguments sake I'll just use fakes) and their info. The DOB and Comments are extras I put in, it can be helpful for quick looks. Since you probably don't know the exact date of birth, you can do a general guess...since you know they weren't probably full grown when you caught them depending on their size you should be able to guess with in a month or 2 of how old they really are. Comments are useful for notes on ear length, personality, general litter info, fur quality, habits, or health issues even that you can update as things go along. Things like that though can be kept on a doe record sheet or a buck record sheet too (I do both for every rabbit as the record sheets provide more in depth on each litter (size/color/types/sexes/etc). The breed and sex are also added in, can be just on the current rabbit and not the ones behind it. Some make their own pedigrees or use pre-made ones. Dam (mother) and Sire (father) on the pedigree won't be filled in but as you breed and save kids, the info will be bumped backwards. It never hurts to keep several copies (digital and paper) just in case of fire, theft, or loss of some other kind.
Example of what you might put in the first block on the pedigree and cross out the others as you don't have that info (the actual first rabbit, the ones you have with no other background info). I'm assuming white and a few other things, again its just an example. The pedigree should branch out like a side V, no matter how the paper's laid. I think I still have an old PDF free fill in pedigree from M and M Rabbitry I saved before they closed down/changed (can't find it any more online). If I can find it, I'll post it. There are several other freebies out there that will do ok too or can make your own of course
There are some programs as well, but there rather expensive for just starting out.
DOE:
Name: Jake's Rocket Ship
Sex: Doe
Breed: New Zealand
Ear Number: JRS
Variety: White
Weight: 11.0
DOB: 02/12
Comments: This rabbit was a good mother, no health issues.
BUCK:
Name: Jake's Rocket Top
Sex: Buck
Breed: New Zealand
Ear Number: JRT
Variety: White
Weight: 11.08
DOB: 03/12
Comments: This rabbit good producer, mostly females over males, no health issues.
OFFSPRING'S PEDIGREE:
Name: Jake's Prime Drop
Sex: Doe
Breed: New Zealand
Ear Number: JPD
Variety: White
Weight: 11.02
DOB: 05/12
Comments: Brood quality, broken nail.
Dam: Jake's Rocket Ship
Ear Number: JRS
Variety: White
Weight: 11.0
Comments: This rabbit was a good mother, no health issues.
Sire: Jake's Rocket Top
Ear Number: JRT
Variety: White
Weight: 11.08
Comments: This rabbit good producer, mostly females over males, no health issues.