Hi @sf94 Great question! So remember that LLC's are normally formed at the state level. If you chose to be SMLLC, generally it goes right onto your Schedule C. However, you have the option to pick a different classification if it best suits your business. Here is a link with the the different classifications:
https://www.irs.gov/businesses/small-businesses-self-employed/llc-filing-as-a-corporation-or-partner...).
Most people in general, form the LLC for the protection aspect (this is not legal advice).
With regards, to your question about quarterly estimated income tax it will depend if you remain a single-member LLC.
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