I don't know if there is really a beginners frogfish. The more commonly available animals all take about the same husbandry. I guess that would mean which angler you could afford to lose.
Histrio histrio, the sargassum angler is fairly hardy, a good feeder, and fairly inexpensive. They are best suited one to a tank as their canniballistic tendencies are well known.
Antennatus (Antennarius) nummifer (Spotfin, Coinbearing or whitefingered frogfish) are one of the most common in the trade. They are rather somber in color and markings and are one of the cheaper frogfishes available.
Antennarius pictus and multiocellatus are widely available and only grow to about 4" making them a likely candidate. Wartskins, A. maculatus are commonly offered in the trade but can fetch upwards of several hundreds of dollars... not necessarily one to cut your teeth on.
Stay away from Histiophryne, Antennatus tuberosus, and any of the lesser mentioned genera and species. They are going to be super pricey and don't have a great track record. longevity-wise, in hobbyist aquariums.
In my experience, all froggies need pristine, reef-quality water, moderate current, temps in the 75-77°F (24-25°C) except for the southern Australian anglers, a quality, marine-based diet, and try to keep them one to a tank, no community set-ups.