Ok so I'm a newly engaged and have no idea what order these things go in. Our wedding is scheduled for August 8th 2015 and I want to get a rough estimate of how many people we will be having so I want to send something informal like an RSVP card then once I get those back send the formal wedding invitation and finally the Save the date about 6 months beforehand. Is this a good idea? Any advice is appreciated. Thanks!