Quick Thoughts On Charts
If you know how to make charts and you write songs, write charts out for your songs as you write them. Compile them and save them.
If you don't know how to write charts, learn. I personally tend to avoid using charts not because I can't read them, but because I don't like them. But some people do so it's not a bad habit to get into. And if you do them right away, it's a non-issue if someone ever needs charts.