probably someone has mastered it who isnt a mastering house??
but its no prolem do it your own... wav files are fine.. its important that these wav files are in 16bit 44.1KHZ, that is necessary for an audio cd, many burning programm could convert, but i would not trust that..
it has to be redbook standard, most programms can do it, i use nero for it.. worked everytime smoothly for me
1) use quality cdr, not the unlabeled cheap ones...
2) setup all the tracks in the programm as you like it, (CD Text, etc..) dont forget to setup the gaps between the tracks, for example in nero its set to 2 seconds..
3) burn at slowest possible speed
4) burn twice and send 2 copies to the manufacturing plant
one labeld with "CD-Audio Master" and the other one "CD-Audio Master Duplicate Backup Copy),
5) be careful you dont get any scratches or fingerprints on your cds
6) give both cds into a good packaging (Jewelcase, DVD Case..) etc
listen through the new master cd completly on you stereo, take special notice on the gaps between the tracks... usually, everything should be fine
and yes, avoid overlenght of more then 77minutes.. its possible that you make a cd like that, but then its not standard anymore and you dont have the guarantee that every cd-player can read it.