For startups and entrepreneurs, you need to be very careful on FB ads and Adwords. You can quickly burned through A LOT of money if you don't know what you are doing! I personally use fivver.com to find and test out people who can help me on marketing projects. Its a low cost investment. Only use people who are top rated and will a lot of great reviews.
Also, before going the FB Ads and Adwords, here are some free or low cost marketing tactics you can do today to quickly start building reputation, authority, as well as generate leads for your services.
Hope this is helpful! Good luck!