Groups...? Not sure I can help you there, sorry. I don't get to play a lot, and when I do play it's around a table with a group of friends I've been playing for decades with (literally). Online groups don't work for me because of timezones.
As for the game itself...I'm going to assume that you're talking about joining a 5th Edition D&D group - DnD5E.
If you've never (or barely) played before then I'd recommend you don't stray beyond the Player's Handbook (PHB) for your first outing. There are other books that can provide additional and supplementary material, but that will only confuse you if you've never played before. Stick to the PHB and try to become familiar with a few core concepts to begin with.
Outside of the 6 stats (attributes), there are three major elements to character creation in DnD5E: Race, Background, Class. The PHB does a reasonably good job of guiding you through the process and steps. Before you start anything, though, it's important to have a Concept in mind - at least a basic idea of what you'd like to play.
Backgrounds: there are a good number of them in the PHB, and they can help you solidify your character concept. Note that backgrounds not only provide a brief idea of how it might fit into the gameworld from a narrative perspective, they also give you starting skills, equipment and money.
Classes: some Character Classes that can be relatively easy to play from a mechanical perspective are the Barbarian, the Fighter, the Paladin, and the Rogue (I'd also suggest a Ranger might be a good option; some call the Ranger Weak and Wasted, but the Ranger is best played as a Support character to others - Rangers tend to do really well while backing up others; they do a little bit of everything while not excelling at anything). I suggest those classes because they're mostly combat and/or stealth oriented, and also touch on the magic system enough to let you get a feel for it without you stressing about it being the primary focus of your class/character. I generally suggest new players avoid full spell casters, as that can come with its own set of pain - although if you're wanting to look at a spell caster, the Cleric or Druid would be good to get you started (and it never hurts to have a healer around
).
Racially: Humans, Elves, Half-elves tend to be the easiest to grasp for new players. Humans, obviously - you are one. Elves...because everyone has come across them in film and literature, so you can likely figure them out readily enough. Half-elves...because it can be fun playing a character who has the blood of both and is often shunned by both. I also suggest them because they're likely to be less challenging from a game mechanics perspective (certainly during character creation).
...and that's a quick'n'dirty starter. Hope it helps! Happy to answer more if you're not sure.