Here are a few suggestions, rules and tips for proper wedding etiquette:
As far as who is invited start adding anyone and everyone you would want to include and once you finalize venue arrangements and food plans you can slowly start removing people from the list. Consider all family-even second cousins, friends of your parents, co-workers, people from church etc.
To organize this list instead of writing it down on some random piece of paper that you will end up losing, you should put it all into an excel file with the name of the person: Example: Mr. & Mrs. Tyler O'Bryant or if you are going to address less formal Tyler & Jocelyn O'Bryant. You could even choose to add family at the end if the whole family is invited to attend. Then make sure you add their full address. You can even make this list in a Google document so it's all in once place, which might be easiest so that multiple parties like your parents and fiancé can view the list and add to it as well.
If you are sending out save the dates then you really do need to have a good idea of who is invited. If you do decide to invite other people last minute then you can send out announcements/invites. Just because you're doing save the dates doesn't mean you should ignore sending out announcements/invites. There is no rule to this so it is up to you in the end. But it is a good idea so you don't have that awkward oh I forgot you phone call.
Make sure to send everyone in your immediate family a save the date/invite if they live in a separate home than you. (This includes brothers and sisters who are already married if you have any.) Don't assume, "Oh, they're family and will just come." Especially if you're having a summer wedding. That is the busiest time of year and most families make plans and have prior commitments.
Since Ty and I got married in the summer and wanted everyone in our family to be able to come we called/texted/emailed them the date right away so they could plan accordingly and make travel arrangements.
Happy wedding planning :)
Happy wedding planning :)