first of all boys begin with the active pills. There's nothing magic about starting on Sunday is just a convenient starting time. Certainly if you are not sexually active you can begin your pills any time you wish in your cycle. you should be on the pills two weeks before initiating sexual activity if you wish to wait pregnancy
. It may take several months for you to figure out your normal cycle on the pill. You may have spotting or breakthrough bleeding
. Hopefully by July things will settle down and you will know how things are going to go. You can always skip some all of the placebo pills to manipulate the start of your period. There is no medical reason you have to bleed every month.