That sounds like an awesome, amazing idea! You can get books to help you write your own invitation at online stores like Etsy.com, Officedepot.com, and Target.com.
Invitationconsultants is a great website to use to find sample wording for bridal shower invitations.
You can always be creative and create your own unique wedding invitation to make it have more of a personal touch. If you decide against that www.americangreetings.com is a great way to find some wording for your invitation or to help you create one of your own.
One can find many birthday invitation wordings online. There are lots of templates and examples on Invitation Consultants' website or also on DGreetings' website
There are many websites helpful in creating invitation wording for events such as weddings and parties. Wilton dot com has information on proper etiquette for invitations. Libraries would also have a helpful selection as would event planners.
You can get help with wording for Christmas invitations by going online and visiting any of these sites: Punchbowl, PurpleTrail, Invitation Consultants, or Invitation Box. There are many other sites you can use as well.
invitationconsultants.com seems to be a pretty good website, since they say that they let you sample wedding wording. This may also mean that they will help you find the perfect wording for your event by looking at what you've already bought and doing helping.
anything with right spelling and grammar.
It is primarily the responsibility of the bride but I think the groom would have an input. On occasion, the bride's mother/family but the final decision should be the bride. Here is an infographic for http://www.digbyrose.com/2012/infographic-complete-guide-to-save-the-date-cards/ wedding invitation wording that will help you with your answer. If you using an invitation designer, then he or she would help you with the wording.
You can find some free examples at the website invitationconsultants. They give several examples of invitations, for many different kind of occasions.
This website shows you some examples that you can have at weddings. There are many samples for you to look at; depending on who is writing the invitation. http://www.invitationconsultants.com/sw-wedding.aspx
Some books include dictionaries, thesaurus, and magazines. You can find these books online, in a book store, or in a library. You can also look for ideas for the wedding.
Free invitation templates can be found in several place. Try your local library first. Sometimes they have books that include templates that you can use for several different occasions.