Firstly, I'd strongly recommend you concentrate on music, and that you don't relegate this most important component to second or third place.
You
can perform a disco without lights and without a dedicated PA system - I've done it many times when I first started, but you'll always fall to your knees if you haven't got the music. You are going to need a good collection of music from the 50s right up to the current if you are going to be able to deliver as you say on your website. I'd say a good 2,000 of the best disco-worthy material from this span would be a good starting point.
I don't want the following to sound like random criticism, as it certainly isn't; More a case of pointing out possible areas for improvement as you are obviously new to this, and we aim to advise and assist budding DJs like yourselves where possible, constructive criticism often being the simplest and most direct way of doing this.
I've looked at your website, and the statement,
"We both have a wealth of talent and a wide range of musical knowledge"
would start alarm bells ringing when faced with your photos, as you are obviously young and therefore almost certainly not as experienced as you suggest. I recommend you re-word that, or leave it out altogether. One of my pet hates is seeing a DJ claim he is the best etc., and the public often perceive things in a similar way.
Also, on a more technical note, the following fonts are stated in your HTML code:
"Superpsionic"
"Haettenschweiler"
"Franklin Gothic Demi"
These are not standard web fonts, and many systems simply will not have them - none of mine do. The web browser simply replaces the missing font with a standard substitute which will affect how the page appears. If you feel the need to use a fancy font and can't accept a more usual one, it might be better to produce a .gif image of it, and use that on your page.
Finally, setting up a disco with a friend......
If I hadn't done that, and had had the nerve to go it alone at an early stage, things would have been an awful lot better, faster. That is one of my BIG regrets from the past - putting too heavy a dependence on 'friends'.
I think you'd be better sorting out which one of you is going to take on the business, and then for him to sort out a reasonable circle of friends/helpers for rigging, moral support and so-on.
Good luck, and go for it! - No real reason why you shouldn't be successful if you develop the right attitude.