I have a template for random oligonucleotide library synthesis, which will go successive 10-15 rounds of PCR before starting SELEX. Tell me if I am correct, the end product of one round will be initial template for 2nd rounds onwards ??
After amplification, purification, the first PCR product will be used for the second round as a template. Before SELEX, check the quality of your library, do qPCR for at least 10 rounds to be sure it will work or not.