Not a problem! There's always room to polish up plots, and you might want to create a few different visualisations (for example, a barplot to see what typical and non-typical case lengths are like), but I think you have a good foundation to start tinkering now 
Feel free to ask if you have any other questions!
Also, if you feel like I answered your original question, marking the topic as solved will help other users who have similar problems in future 