I had cycled all my life as a means of transport Paulo, but not much as a sport. I had bought a proper dropped bar road race bike not too long before getting injured as I wanted to try my hasnd at triathlon. It had clipped in pedals but I road those with a pair of trainers, as my ankle ligamnets and fibula would not allow me to unclip, for which you turn your ankle outwards. I would advice flat pedals in your case!