For manga, just go to Bookwalker,jp / Booklive,jp. I prefer Bookwalker (as I have English manga / light novels too) but both are good. There is also eBookJapan.
Considering 99% of the stuff there have free samples and its possible to read some manga volumes for free, you can basically already try to read whatever you want and see how things go.
For anime with Japanese subs - Netflix? There used to be Animelon ( which was great, not exactly legal but still…)
For Jdrama - Viki . They have Japanese subs on some of the Jdramas which is great.
P.S This is so soo out of topic