Eek!
First of all, there are some great ideas for invitation wording on this forum and online. For the forum, just go to the search button and search invitation wording or some such and find threads on this.
We actually looked at invitation websites and at the pics of invitations for wording too.
This site is also good:
VerseIt.com for all kinds of ways of wording wedding invitations and announcements.
In terms of inviting people to a reception for after the wedding, but sending that out beforehand, ...
Maybe something like: In February, ___ and ___ will be married in an intimate ceremony in Mexico. We invite you to celebrate our marriage back home in Wisconsin (or wherever) in March, ___.
Please save the date (or if it's an invitation, just give the details):
Please join us for a celebration of our marriage at
The Pool House
Wisconsin
Cocktails at 6pm
Dinner at 7pm
Sound ok? :)
There are tons of great ideas, just thought I'd try to give you some little bit of feedback!
And I'm sure I only answered half of your questions.