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...do I have to file a separate tax return for the trust or just report the dividends, etc. under my ss number?"
First, you should consider seeking assistance and counsel from a professional conversant with trust issues.
If you decide you would like to handle the matter on your own, you will need to apply for an EIN for the trust; the trust became a separate entity when your mother passed and needs its own tax ID number.
See https://www.irs.gov/businesses/small-businesses-self-employed/apply-for-an-employer-identification-n...
In any tax year in which the trust taxable income or gross income of $600 or more (regardless of taxable income), the trust will have to file Form 1041. See https://www.irs.gov/instructions/i1041/ch01.html#d0e378
In order to prepare a 1041, and associated K-1s for the trust, you will need to purchase a copy of TurboTax Business as well as a personal income tax preparation product (see note below).
TurboTax Business: https://turbotax.intuit.com/small-business-taxes/
Note: TurboTax Business must be installed and run in a Windows environment; it is not available as an online product nor will it run natively on a Mac. Further, you still need a TurboTax personal income tax preparation product since TurboTax Business is not capable of preparing individual income tax returns (it can only prepare returns for entities).
