Post-it note Marry, I'm writing to inform you that I will fly to London to visit our important client, Dinane Fahey next Tuesday. I wish you could reserve flight tickets and a suitable hotel for me. During these days, I need you organise the company. yours, Kent. I hope someone to correct my sentence structures and grammar mistakes. And also give me some advice to improve my English writing.

There is a sentence I realy don't understand. " Similarly, if target customers don't have the habit of reading newspapers, having your advertisement printed on newspapers will surely be a waste of money." I realy don't understand what's the meaning of the "having" in the sentence? And if delate the "having" , Is the sentence still correct? I wish you help me.