[Koha] checkout doubts

hi, I have added the records in cataloging - (selected in MARC21 format) and added the records I have given the admin -preferences -Cataloging - autoBarcode - My bar code starts with 1. For the records added increment by 1. When i create a patron, it shows Unable to checkout. The specific item i have specified is not a reference.and i haven't not for loan. I'm able to checkout the item type book. Is it only possible to checkout the book. -wont it be not possible to checkout the audio visual,music types etc kindly help out thanks sivasankari