The arranger makes playing a lot easier, but that doesn't mean it is a pushover, even to get to a rudimentary level. There is still a lot of learning to do, and it depends where you are starting from. Some of the people you hear on line may have been playing for 30 years or more and maybe even at pro level. Many of the people coming to the arranger for the first time already have some musical background even if they did not play keyboard, so they have a head start with things like the feel of the music. You need to learn most of all to listen properly. Listen to a version of the song you want to play and hear the tempo, genre and overall feel of the music. Then try humming the tune while you play the opening chords with different styles running and try to hear if they work. There is no magic abut picking styles. Learning to do things for yourself will be better in the long run than asking others for the answers. There is no magic about picking a style, its It is mostly trial and error. And nor is there right or wrong, its how it sounds to you that matters.
Start with easy songs, three chord simple tunes. The fake books are good but you have to be selective about what you play because they contain lots of sophisticated songs as well as simple ones.
And consider lessons. Find a local music shop which offers them, or at the very least try on line lessons.
Mike