mail merge help business forms -Word1

I need to create forms called an entry notice to customer tenants, many at a time, the forms are filled from a report that I can compile from my project management software in the form of a csv. my issue is that the output needs editing in between with excel to change some formats such as dates into dd/mm/yyyy formats and a time field that comes out as eg 9:00am, 9:20am, 9:40, etc which need to come out in the form as a time range all the 9:00's need to come out as "9:00am to 11:00am" etc. I also need to make a few finished off lists and spreadsheets from the data as well that would be nice if it could be streamlined. If this is someones specialty, please come forward and I will give more information. Kindly Bid if you understood my requirements otherwise do not waste your & mine time.