Alicia,

Your best bet is to contact the fertility clinics themselves, as each clinic does things a little differently. All in all though the process for straight and lesbian couples going through fertility treatment is essentially the same, so the reason you can't find any specific information is that there really isn't any. If you wish to use a sperm donor then most clinics have information like that on their websites, it usually refers to straight couples but like i said the process is the same. If you find a clinic that does things differently for lesbian couples then I'd reconsider using that clinic because to be honest theres no reason for it to be any different (for example one clinic wanted us to have a waiting period of 6 months, but i rang back a few days later and pretended to be in a straight relationship needed a sperm donor and no waiting period...).