Here is a three-part video series I made on the topic of learning vocabulary. I hope to give you some ideas!

Part 1 - Choosing Which Words to Learn

This one is about choosing which words and phrases you should learn.

Links I mention in the video - 

The top 1000 words in English - PDF

The top 100 Business English words

Part 2 - Memorising

Japanese site: here
Quizlet Flashcards:
Anki Flashcards:

Part 3 - Activating What You Learned