G'day and welcome to Dakka and to the hobby!
Dark Angels are a great choice as Kroem said. They've got a nice amount chapter-specific kits available which really helps in getting your models looking appropriately Dark Angel-y!
Sound like you've done some good preliminary research and the Codex is a great place to start. With making vehicles like Rhinos and Land Raiders specifically Dark Angels themed, much of that comes down to the paint job! In the past there has been a Dark Angels transfer sheets available, though I'm not sure if these are still. Also in the vehicle boxes I believe they used to include transfers for a couple of the major chapters, though I'm not sure if they still do (its been a while since I brought a vehicle).
Forgeworld also does some chapter specific vehicle doors and panels if you want to go the extra mile but that can be an expensive route, especially if you're just starting out.
Do you want to go down the Primaris or regular marine route with your Dark Angels, or do a mix of the two?