You will be filing the business on your personal return on Schedule C as self employment income. For tax filing your business is a disregarded entity. All the tax is paid on your 1040 return. So pay the estimates as an individual 1040ES. Just pick Individual.
Pay directly on the IRS website https://www.irs.gov/payments
Be sure to pick the right kind of payment and year.....2024 Estimate
Unless you are a Single Member LLC that is a S corp. Then you do need to file a separate Business return.
