I am filing Business taxes only, how do I got abot

what type of entity is the business?  a sole proprietorship or single member lLC files schedule C with the 1040 form.  other types of businesses must file their own return - Partnership (1065) or S-corp 1120S) which issue k-1s that flow through to your 1040. Calendar year returns for these are due 3/17/2025

the other type of entity is a regular corporation that file form 1120 also due 3/17/2025. None of its income is taxable to the owner. 

there are many different rules concerning each of these. I would strongly recommend that if your business is a partnership or corporation, you consult with a tax pro for the first year.