I take it you are planning to start from scratch with short hair (less than 3" growth). I don't know how much research you've put into this but there's a lot for you to consider. I started the locking process in November of 2002 and I had a good 5"-6" 'fro going on in preparation. This was necessary for me because my hair was already mostly grey and hrey hair has a mind of its own. My journey to loc'd had a few false starts and learning experiences and it took 18 months to achieve a total locked head of hair. You must be patient.
Let me share a few findings with you. First, never let anyone put beeswax in your hair, ever. Most locticians prefer loc butter (Loc'n'Twist, Mango and Lime, etc) and that's fine for continuing care but if you want to get the process junp started and especially if you have shorter hair use raw aloe vera on your initial twists and wash it out after 28 days. This is a method widely practiced in the BWI and it works.
I have had my locs retwisted and touched up in Santo Domingo and I will say for the record that even hairdressers who were not familiar with the process when we began caught up very quickly. Dominican hairdressers aren't putting everybody else out of business for nothing. These Women understand all grades of hair probably because they work with all different grades of hair every day. You could probably walk into most of the salons in Santo Domingo and get a decent wash & twist but it will take someone who is familiar with the entire process to get you started off correctly so I would suggest that you go with Anastacio's suggestion. Many of these practicioners have pretty good networks and for something they're not really comfortable with they'd probably be able to give you a very good referral. Then there's always the 'go ask somebody with the loc's that you want' approach. It's a word of mouth business and hair dressers change business addresses and affiliations often.
If push comes to shove, go to BC, find a Haitian braiding hair and show her the video
How to Start Twist/ Retwist Locks - YouTube
She'll probably get it right the first time and you won't be charged salon fees.