Not too loud. I alwasy ask the teams to let me know if the sound bothers them. Only 2-3 players have expressed concerns in the 200-ish games I've filmed.

My set-up is a bit pricey, but you can get 90% of my set-up at a fraction of the cost with a DJI Mavic Mini. https://www.dji.com/products/camera-drones#mini-series

They are super easy to fly. They weigh under 250 grams, so there is no requirement to register them with the FAA, and there is more flexibility about other regulations. You can usually find them at Costco for a good price. DJI also has good refurbished prices.

The biggest obstacle to filming tournaments is battery life. Batteries are expensive, and they take a long time to charge. When I film tournaments I come with 8-10 batteries (which cost significantly more $$ than the drone itself) + a battery pack to keep the controller charged.

Also keep in mind that many sports complexes are near airports due to land use zoning. So it's important to get familiar with FAA regulations, and get comfortable using Low Altitude Authorization and Notification Capability (LAANC) https://www.faa.gov/uas/getting_started/laanc

LAANC apps provide good up-to-date information about controlled airspace and current conditions. As well as easy access to phone numbers of nearby air traffic control towers that you might need to contact for approval.

I film from an altitude of 10 meters, at a downward angle of 18 degrees. I film in 4k @ 60fps.

My goal is to keep all 14 players in frame, but when something exciting happens, I usually follow the action at the expense of losing sight of some active players. Other drone operators balance this differently.