I have had involvement in the past with many of the
GA's that do predominantly health, and I would recommend HealthChoiceOne.
The assist in getting advance if you need that, and provide a ton of training, and pay you the full street rate commissions right out of the gate, which you won't get going direct with a carrier.
Also if you are unhappy you can drop them at any time. Many other
GA's will require you to be locked in at least 6 months after you leave, basically trapping you.
Don't be swayed by
GA's that offer leads and other extras and then want to take a piece of your commissions, always get at least full street rate, and buy your own leads if you need them.
I will warn you though, based on your post and my past observations, expect many, and I mean many offers to now come to you from agencies/
GA's wanting to "help" you offline with getting started (being recruited)
Ken