L Visa

I am not traveling with a group. I am traveling alone and I am confused regarding the COVA. Do I submit everything electronically, print and mail, or appear in person at the Washington DC office. I live in Nashville,Tennessee. I will be in China for more than 6 days - around 14 days. I think I should apply for the L VISA, as I am a tourist. I will depart the US September 29, and arrive Beijing October 08, 2024 from Seoul, Korea. Routing - Beijing,Xi'an,Chendu,Chongquin,Shanghi,Shenzhen,HongKong. I have been advised to apply for the VISA in August. I am working with different tourist operators for assistance. Thank you for your help. Martha