Learning kanji can be hard, but when you read sentences that have the hiragana substituted with kanji, you learn a lot quicker.
Anymore than 50 per month for me and it would be overwhelming.
Writing kanji is where I found it the most difficult.
I would suggest to any learner to just practice writing kanji in the
correct stroke order over and over again.
THIS is a great tool for such learning.
A total list of the 1000 most used kanji for memorisation can be had
HERE