You are always better off to get clones that you know are female and have seen the finished product for the first run, just to get you started. This will speed up the process of your important run.
Once they are started, you can germinate and sex out the seeds. I recommend taking cuttings off each plant once seedling is big enough, flower them, and tell which Burmese kush pheno you like the most. Seeds take time and care if you want the best. I would just do clones for immediate growing purposes; and its less risk. Hope this helps. -Cheif