They're seasonal and pretty much autoconclusive, meaning this years has his own story and characters and the next year will ahve his own story, characters and motiff, and bar a few episodes there won't be intermixing.
Ideally start with Kuuga, Agito, Blade from 2001+
My first ones were Fourze, OOO and W in that order they're from 2010+
With years they became less and less gorey and violent, with less mature plots, and now they're toy comercials with plot pretty much. But some are still nice, Drive and Built for example, I liked it a lot.