I am new to this. I started a side business, LLC. Do I file taxes for that LLC or can I add it to my personal tax return, or does it have to be separate?

What kind of LLC?  Are you a Single Member LLC?  Did you elect to be a S corp?

ALL of your 2022 income goes on the same Form 1040.  Since you now will need to enter self-employment income you will need to use online Self-Employed or any version of the CD/download in order to prepare a Schedule C for your business expenses.

https://ttlc.intuit.com/questions/2926899-how-does-my-side-job-affect-my-taxes

https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/26653

https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922

https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax

https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c

https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct

https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs

if it is a single-member LLC that hasn't elected to be treated as a corporation, then you pretend the LLC doesn't exist and generally would report the activity on Schedule C included in your return.

If you are a single member LLC that has not incorporated in your state then the IRS considers your business as a disregarded entity.  You report your self-employment income and expenses on a Schedule C.  The Schedule C is included with your personal tax return Form 1040.

See this TurboTax article for a beginners guide to self-employment - https://turbotax.intuit.com/tax-tips/self-employment-taxes/beginners-tax-guide-for-the-self-employed/L2HLojrj5

You will need the TurboTax Self-Employment online edition for your tax return - https://turbotax.intuit.com/personal-taxes/online/

Or you can use any of the TurboTax desktop CD/Download editions but the Home & Business edition is recommended - https://turbotax.intuit.com/personal-taxes/cd-download/