Email to Museum ( English Task on courses) ~ Check it please ^^'

Dear Madam,
Our college Science Club have seen your advertisement and we are interested in an excursion. However, I have some questions. I would appreciate it if you wouldanswered to it. them.
At First, I would like to ask about refreshments. Could you tell me, please, are there any snack bars near the museum, where our group could have a nosh break?
I would be grateful if you also would informed me about your booking procedures. Is it necessary for pay for the  group in advance, or can we buy it individually on the spot? We have studied the schedule and I would like to know in what time is it better  best to attend an excursion? Can you give a piece of advice, please?
In addition, I would like to ask about the size of the group. Are there any restrictions on the number of people? Our group is quite large, therefore I am a little worried about this matter.
I would be grateful, if you would answered these questions. I hope it will not be overly time-consuming to you. I look forward your mail.
Thanks in advance,
Anya,
Secretary of  College Science Club