According to PayScale.com, the average nurse salary today is somewhere between $38,000 and $78,000 per year ($20- $37 per hour with $26 being the average). There can be huge differences in pay from place to place. There are several things that will affect this base rate of pay in your nurse salary. Some of these are:
Ideally, wedding invitations should be sent 8 weeks in advance. You should ask for people to RSVP no later than 3 weeks before your wedding. Way too early. I wouldn't sent them out till 6-8 weeks before the wedding. I'd send them out in about Mid-May. Only because people are going out of town during the summer.
Usually, the guideline is 9-12 months in advance, so it's actually not too early. It is too early for the full invitation, though, so send the save-the-dates now and wait a little bit before sending out invites. Usually it's 6mos. 9mos. or 12mos. before the wedding.