There’s no need to put songs in any particular order. Songs will need to be reordered by your DJ according to bpm/tempo range, key and genres anyway.
All playlist info should be submitted at least 14 days before the date of your wedding. Song requests cannot be guaranteed if they are submitted close to the time of your wedding.
You’re also welcome to send your DJ a link to a Spotify/Apple Music playlist if that's easier for you.