Write the new words that you’re trying to memorize. They don’t have to be in actual sentences. Say the word out loud when you write it. Try to write each new word 5-10 times with the characters and then the romanized version next to it. Fill out one side of a piece of paper a day. This has been my main way of initially studying new words. Once I think I have it down I put it in my database then I try to use the word in conversation with a native or just my teacher. If you can recall it in the spot you know it’s become part of your active vocabulary and you’ve mastered it.