The posters above are mostly recommending brands.
I'd recommend thinking about the cuts easiest to use by someone starting out. A ghost cut is relatively easy, IMO. Get a ghost from Sadler, Houndstooth, Tom Teasers (Cracked Corn), Joe Slayton, Hooks, whoever.
Alternately, try a split V like a Redneck Hen (Tom Teasers) or what Sadler, Hooks, Houndstooth, Joe Slaton, etc. offer.
Alternately, try am inverted V like a Tom Teasers Bad Girl or Legacy Tom Boy or Fatal Attraction or whatever Houndstooth, Hooks, Sadler, Slaton, etc. offer.
Then, you need to figure out which videos to watch to see how to position the call in your mouth, how to use your tongue and jaw, and sometimes your lips, and how to use your diaphragm. I can name two off the top of my head, one from Tom Teasers that is intro level, and Mouthcall Magic by Scott Ellis. MM from Ellis is a little more advanced, but you'd still learn some things by watching it because Scott makes points that others do not. One of the most valuable things Scott does is focus on how to make a yelp with rollover and how to explore/test the call to find the parts you want to hit to make it. I have not seen one single video that is totally comprehensive, they all have some flaws in articulation and skip over things by assumption, etc. So one can pull together a lot of things from different videos and perhaps find his style in one that he did not in the others.
This is a good example of Scott Ellis' instruction on making a yelp rather than a bark.
https://www.youtube.com/watch?v=LkKR3eYnBd4
