Company legal and tax assessment

The company has been operating outside the USA for two years, but in April we joined the USA, specifically in Delaware.
We are in need of a specialist in legal and accounting matters to get things started.

Company description:
Type: C-corp
Category: Japanese courses
Number of employees: 1 (Fundandor)
Other workers: All other teachers are self-employed and invoice the company.
Income: Only for the monthly payment of the subscriptions to the courses.
Physical assets: None
physical locations: None
Working method: online
Physical presence in the USA: None

Documents already completed on incorporation:
1- Certificate of incorporation
2-EIN
3-Board of approval
4-Bylaws
5-SS-4
6-Founder Stock board consent
7-CIIAA
8-CSPA

Main needs:
1-Verify if any extra legal paperwork is necessary before starting.
2-Advise a method of keeping books.
3-Advise according to criteria points to take into account.

All work will be carried out via Chat or mail.
More details to be awarded to the job.
PS: If this work goes well, we are looking for an accounting and tax advisor to work with us periodically.