As a guy who has done his own fitting, I would recommend waiting a bit on clipless pedals and here is why:

They add another variable to your bike fit that can complicate things. I would recommend riding a few weeks minimum with platforms and getting the rest of the bike fit properly for you, and then introduce the pedals.

For example, it would be much easier to diagnose a knee pain problem if you can say, "I rode for three weeks on platforms with no pain, but when I switched to clipless, I started having pain" versus "I just got this new bike and my knee hurts when I ride it."

Just my .02