It's becoming very popular to send "save the day" cards to alert guests about your planned wedding celebration.
Once you have all your plans finalised you then need to send a more formal invitation. The invitation should state your venue, date and time and information about the reception.
There is also the question of who will be hosting the celebration. Some couples follow a traditional route and the bride's parents host the wedding, especially if the bride's parents have made a major financial contribution.
Alternatively you may prefer to send the invitations from you as a couple.
When composing the wording for your invitations you can use the word "Marriage" if the Registrar will be present or you have completed the legal declarations prior to your day.
Choosing a Celebrant to help you create that special ceremony is an important step towards making your occasion a really memorable one. Why not take advantage of the free initial meeting I offer ? I believe it is important to meet informally to discuss your ideas and what I can offer. Meeting also gives us an opportunity to explore the type of ceremony that would best suit your needs.