[Koha] Barcodes and scanners

Hello, We're a Senior High School considering Koha as our ILS. Are we able to use pre-printed barcodes from someone like Leigh Mardon, or do we have to print our own. Also, are all barcode readers created equal in the Koha world, or are some more equal than others? -- Hei konā mai, Mark Osborne Deputy Principal, Albany Senior High School.