I found Myer Lemons quite variable from seed, some seedlings look like limes, some like Citrons. You won't get true Myer Lemons from seed.
They are grown from cuttings, which might be successful in pots with the right care.
Lemons are more true from seed, but could take a while to fruit from seed.
Another option is buy Citrus rootstock seed, and bud / graft propagate scions from your purchased grafted plants.