I was not able to start taking camrese until the wednesday after my period had started...What should I do with those first 3 pills? Just skip them?

Take at end of pack. You can take the 3 pills at the end of the 3rd week, then take the last 7 pills. This will set your schedule to a sunday start. To be safe , i would use condoms for the rest of the month.
Take them. The best thing to do would be to start with day 1 on wednesday and take the whole packet. What day of the week you start on doesn't really matter.