Really like what PinkSwoon said - agree with it all. To add to that...here's a suggestion.
I'd suggest a launch event - have an in-salon cocktail evening, invite current clients and prospective clients (ie bring a friend) and offer some sort of launch special - and also you might consider an MC and guest speaker of some sort.
If you then have the launch event as the central marketing piece, you can then have all your promotions lead everyone to attending the event (unless it's by invite only) and in the weeks leading up to the event, you can create buzz with your current clients and around the area with promotional activities.
I'd try and integrate (sorry, horrible marketing term) all the promotions that you do. What I mean is this - plan your promotions leading up to the launch so that they are released in some sort of planned way where your target market will see/hear them in all sorts of places over the promotional period and NOT so they are ad hoc and get lost in their own noise.
You could do:
Leaflet drop
-Press coverage
-Advert with editorial
-Email messages (and/or in-salon) to current clients
-Leaflets in local and relevant businesses where your target market hangs out (ie gyms, networking groups, pharmacies etc...)
- And more...
Just make sure that every piece of communications has the same message and call to action.
During the event, you can gather names and contact details and from there, follow people up with the special launch offer and get them booked in
I did this when I launched my salon - it worked well. This is only one way to launch your salon and if an event is not your thing, you can still do the integrated promotions - just need a different message and call to action
Good luck and how exciting!