Method 1
Step 1
Learn Hiragana and be able to recognize it at least 70% of the time
Total beginner? Try this site.
Want to review? Try this fun YouTube Series
Step 2
Learn Katakana and be able to recognize it at least 50% of the time
Total beginner? Try this site.
Want to review? Try this fun YouTube Series
Method 2
Japanese from Zero. Speaks for itself.