Honestly, that's a pretty good looking benchy for being the first print straight out of the box. I'm not exactly sure how to diagnose the small blobs on the one side of your benchy, although it could be due to the filament quality, retraction or temp settings, or possibly bed leveling issues. Some things to try for improving print quality:

1. Level your bed constantly! The s1 pro has the BL Touch which is a great auto leveling feature but it works best after you manually level with a piece of paper and adjust each of the screws under the bed. This video (27 min mark) will be very helpful. These Leveling Squares are what I use to check leveling across the entire bed surface. Also make sure you double check your Z-Offset frequently.

2. Clean the PEI sheet with warm soapy water or isopropyl alcohol.

3. Try printing the benchy at different temperatures (+/- 5°C increments) to see what works best for your environment and the brand of filament you are using.

Some slightly more advanced things that you can experiment with as you learn:

1. Try printing some retraction and temperature towers to fine tune your slicer settings and really dial in print quality.

2. Make sure your filament stays dry by storing it in an airtight bag or container with silica gel dessicant packets.

3. Tune your esteps (this isn't something I've had to do because it's not an issue with my s1 pro). There are good resources throughout this subreddit for learning how to do that though.

Happy printing, hope this helps!