hi I really need help

......I've been printing for many years.. However I just trashed my ink jet printer for a laser..i purchased a okidata c 8600 and I was sent laser1 opaque transfer paper....the paper for the dark shirts is not printing as I hoped......I feel that the printer maybe to hot or not hot enough....the ink is not sticking to the transfer paper....though the transfer paper for the lights are working......If there is anyone who can help please.... post a reply....I'm stressed I have so many orders need to be printed......... and we all know time is money...