So themed Wedding invitations or generic is the question. If it is a normal wedding with no apparent theme, then generic wedding invitations will do, although you can choose the invitations in the wedding colors if you like. If there is a theme to the wedding then you have to decide if you want the guests to know ahead of time what that theme is, or if you want it to be a surprise.
No matter what you choose, RSVP cards are definitely necessary. This helps to know how much food and drink will be needed for the reception. After all, you don’t want to spend unnecessary money on too much food that will only go to waste. Careful planning can save money to be used on other stuff for the wedding, or for the honeymoon afterwards.