I'll try to take a stab, since it's right out my back door. I'd expect a few other regulars to pop in as well.
In general: Jupiter ledges tend to be a little deeper than just south of us in WPB or Ft. Lauderdale--70-90 ft., with most boat dives averaging around 80 ft. It is always drift diving when diving off charters. Because of the depths, it's optimal to be nitrox certified. It is not necessary, but your bottom times get very limited if you're diving air only.
I'd say the bulk of the dives in the area are reef oriented, though there are a few nice wrecks in the area. There is a series of three in a row that often get done as a drift--the Zion, Miss Jenny, and the Bonaire.
The life on the wrecks and the reefs have some tendency towards larger species--I almost always see a few Goliath Groupers, sharks are not uncommon, and the largest turtles I see are consistently at the Jupiter ledges.
So, extremely advanced diving--not really; though a little more experience (and nitrox certification) will certainly make you more comfortable. However, if you are still not so comfortable with those profiles/descriptions, the Riviera Beach Marina where many of the WPB dive charters depart from are about 1/2 hour south of Jupiter, and those profiles can range from 20/30 ft to 60/80 ft.
Feel free to ask any other questions; it's not such a bad place to retire to!