How to start reading?

Hey, welcome!

You could start from NHK Web News Easy.
The easiest way to look up vocab and kanji on the web is to use a plugin, such as Rikaichamp. It will show a dictionary entry when you hover over Japanese text.

If the kanji is in an image or a printed book there are two options: use hand-written input on a smartphone or look it up by radicals. For example has Radicals button right next to the search bar.

You could also join an aboslute beginner book club here on the forums.

Oh, on here’s anther useful topic: