Congratulations on your first step. I would NOT start with soft foods yet if I were you. Sure the hunger is annoying but it will not hurt you. Hunger pains are something you should welcome in my opinion. You likely have not experienced them much until now otherwise you wouldn't be here. Remember that hunger pains are annoying but obesity is deadly. Follow your doctor's orders to the letter. He/she has far more knowledge about this than you do and the instructions for diet are for a reason.
Another thought - if you succumb to the hunger at this early stage, what does that predict for you at a later time? Be disciplined NOW! Not later.
Best,
-Al