If you are playing for a dance you are not a performer and the dancers an audience - that's fine for a stage performance with an audience sat listening. A dance band should be totally ''at one'' with the dancers i.e it is a partnership.
The job of the musician(s) is primarily to generate a rhythm that assists the dancers by providing them with 'lift' and making them move easily with the music. Arty farty playing and 'arrangements' can be a hinderence rather than a help
A simple but essential ingredient in getting it right is to watch the feet of the dancers and as the famous band leader and box player Sir Jimmy Shand put it ''it sort of comes back to you and helps you''
Put another way you must play ''with'' rather than ''for'' the dancers.
There is a vast range of types of dance and the musicians need to be familier with the type of dance music and steps they are playing for and preferably also be dancers themselves.
As to choice of tunes it can help to paly tunes that the dancers can identify with and particularly for waltzes well known songs
Also that there is no such thing as 'waltz speed' as a waltz can be anything from a smoochy 'last waltz' to a fast twirling vienese waltz and anything in between. Same goes for quick steps, two steps, jigs, reels, marches, etc etc etc.
Perhaps for starters it is best to spend some time listening to recordings of the type of dance music you aspire two and playing along with the recordings. Also to if possible 'sit in' with established dance musicians to play along quietly and unamplified so you don't upset the applecart!
Playing well for dance is an art and something that can only be developed by experience rather than by having an 'arranger'
george {} :b :ch