You only need the FAA 107 to fly commercially. If your drone weighs less than 250 grams you don't need to register it, but you still need to follow the rules.
The rules are found here:
https://faadronezone-access.faa.gov/#/
If your drone weighs more than 250 grams you need to register it with the FAA for $5. If it weighs more than 250 grams you also need to get a Drone ID module for about $40 if the drone does not already have one... Any recently made drone which weighs more than 250 grams is required to have Remote ID when sold in the USA.
Here are the rest of the requirements from Google:
To legally fly a drone that weighs more than 250 grams in the United States, you must:
Register the drone: Register your drone with the FAA DroneZone:
The cost is $5 and the registration is valid for three years
You can use the same registration number on each drone
Display the registration number on the exterior of the drone
Take the TRUST exam: Pass the free, 15-minute TRUST exam to fly legally
Obtain Remote ID: If your drone weighs more than 250 grams, it must have Remote ID
Submit a Notice of Identification (NOI): If your drone is registered in another country, you must submit an NOI on the FAA’s DroneZone website
Obey the rules of the air: Follow all FAA guidelines and regulations, including:
Flying at or below 400 feet in Class G (uncontrolled) airspace
Using LAANC to get authorization for controlled airspace
Having a visual observer colocated with you if flying FPV
Staying below 400 feet Above Ground Level (AGL) or the maximum height allowed by LAANC for the area
Following all FAA airspace restrictions including TFRs and NOTAMs
Never flying near other aircraft
Never flying over groups of people
Never flying near emergency response activities
Never flying under the influence of drugs or alcohol
Never flying under the influence of drugs or alcohol
That’s racist to say illegals can’t fly them.
/s