If im not mistaken all Myer lemons are clone propagated by grafting. So the seeds you sprout from a Myer lemon may be nothing like a Myer lemon, but then would still most likely need grafting to have adequate
root stock. Your best bet would be get cuttings of improved myer scion, after you root cuttings of the appropriate root stock; then graft your myer lemon scion to make your own tree; however, with all that hassle time and potential expense. Wouldn't it be cheaper an faster to just spend $20 and get a properly grafted improved myer lemon tree? Shop around, im sure you could find a good deal on a 2 year old tree.
Hope that helps!