Welcome to the board and to orchid growing!
Now when you say seeds does that mean you plan to do your own flasking?
Also I might recommend you post this in the propagation section, perhaps will get more answers. Sorry I can't help you though as I've yet to deal with flasking/flasks.
Another suggestion, just do some searches here/throughout the site. There's a lot of good information in old threads about what people have done. Should be plenty to get you started before the others chime in.