Hello Ryan, I don't want to discourage you, but I would just make sure you really understand all that goes into starting and maintaining a business. Do your cosmetologist friends have the clientele to support your fledgling salon? Do you have a location outfitted with the right equipment? If not, how do you intend to make the start-up capital you'll need for everything required to just get you started and the monthly payments that follow? It would probably be a good idea to invest in some salon management software to keep track of and manage your appointments (I use SalonBooker's salon management software myself) otherwise that will be another constant responsibility that falls on your shoulders. You'll also have to consider how you'll be paying your employees. Will they be independent contractors, or do you plan to pay them a salary? There are a LOT of things to consider before you open a salon, and at present it doesn't seem like you have all the resources you'll need. I don't tell you this to discourage you but to prepare you! Good luck Ryan, with hard work and dedication you can make your salon happen.
For local marketing fliers with special offers and word of mouth are going to be your best bet for generating interest. As for getting a presence online social media can be a great and cost effective way to spread the word.