Hi Hun so to answer your questions:
Longed pick up/ drop off: Let parents know that you job is to care for the children. point simple. Explain that you would not invite friends over for coffee as it would distract from your responsibilities, and you feel that them staying is doing just that.
Let them know that if there is a matter which is urget of course you want to know right away, and that they are always free to text you. For matter of the general nature, you can tell parents that they can call you between 1 and 2 during the day ( for me that's in the middle of nap time), or set up an hour say from 5 - 6 pm on Thursdays for conference calls.
As for the rates, I would set it up that your rates increase on Sept 1, and that for exsisting clients to raise them any higher then 2 dollars a year is risky. It is best to charge a little bit less, then to have a spot stay opens for months. I have my rates raises to 45.00 a day, with after hour care being 15.00 an hour, meals 5.00, and late charges of 1 dollar a minute.
If you know what time parents are picking up, try having them ready at the door, that way you can say"oh, ##### loots like they are getting hot, see you tomorrow", then open the door.
I sent out a notice telling all my families that my children are in classes in the evenings( which they are) so that way the parents understand the importance of being on time.
Hope this helps.