Wedding cards should match and have the same design of your wedding theme. The modern and sophisticated way to write the wedding invites is to use a love poem, wedding verse or write something that will match the wedding theme.
The first time you make a WordPress site it may be a bit tricky for you. If you are not very well versed in PHP and MySQL this site can be all but downright confusing to you. Taking it slow and learning to tap into the functionality of WordPress is ideal however and will immensely benefit you in future sites, therefore you should really consider tapping into it for one site at least to see how it benefits you.