My fiancee and I are getting married in September, and would like to take some online dance lessons. We do not want a choreographed first dance, but want to not step on each others toes during our first dance, as we do now! Our song is "Catch the Wind" by Donovan.
What is our best plan of action? Where should we start?
Any tips are greatly appreciated!

You've chosen the music, a sort of groovy Viennese Waltz.

Fortunately, the VW is conceptually very simple. In execution, it can be fairly difficult.

Forget about learning this or any other dance online. In the time that you have you can save up the money for at least a couple of private lessons. Find a good independent studio, tell them exactly what you want, and take your music with you.

You should be able to get a couple of lessons for about 100 to 130 dollars (US). Please believe me, you'll have a lot more fun if you do this correctly.

Best wishes and good luck to both of you.

jj

Edited to add:

Look at my post at 3:03 PM on 01/25 below. There's a slower version of "Catch the Wond" (1968) which will make your dance much less stressful. You could still do a (very relaxed) VW if you wish but this version would accommodate a Waltz, a more traditional wedding dance.