be ready to hear from the opposing coach and parents.
You might be surprised not to hear anything as you will find that most teams will be in the same boat with limited pitching depth; but yeah be prepared too (lol). Again, common sense says if the pitcher is throwing rollers and no where near the plate where the catcher has to get up to retrieve after every single pitch, then it's doing no one any good.
As mentioned earlier, Rec is about development and you will find out the importance of good pitching and catching very quickly. At every practice I recommend you always have someone practicing pitching with a catcher. Find out who wants to be your pitchers & catcher and have each pitcher do some pitching to your catchers at every practice. I advise you have a parent back-up the catcher to help with the balls that get away (for efficiency) and to also instruct/support both the pitcher & catcher.
When I coached minors, I contacted one of the local pitching instructors. He came to one of my practices (for free) and took (4 at a time) girls aside and introduced them to pitching and the motion for about 30 minutes; they threw against a back-stop. This was a good way for the kids to get a qucik lesson and give them an opprotunity to try it and see if it's something they might like to try (or learn hey have no desire or interest in pitching). It went pretty well.