Checkout the Midway holster finder. Some results for EC9s here: https://www.midwayusa.com/holster-finder/filter-options
I and some friends have had good luck with it. I've had one notable fail in that it gave a much too small holster for my Blackhawk convertible. Midway was happy to take it back and give me a refund.
You need to decide how you want to carry. Some stiles are more comfortable/appropriate than others. Back when I was 200lbs (at 5'8") an IWB worked fine for me, but now I'm 125lbs and it's plain uncomfortable. I've a small of the back holster that works great except if I am driving for awhile. I find a shoulder holster very comfortable but they are only appropriate when you are going to wear some sort of jacket. You might want to checkout CC clothing as well, do a quick search for concealed carry clothes, there are lots of options.
If you don't know what you want then I would recommend going to a gun store with a good holster selection so you can try them on. Some gun shows also have holster makers at the show.
Also checkout http://aliengearholsters.com they have a modular holster that lets you build your own however you like.