1) The simplest solution may be to import the 1099-DIVs from your brokerage using Turbotax
See https://ttlc.intuit.com/community/entering-importing/help/where-do-i-enter-my-1099-div-in-turbotax-o...
2) I'm not an expert, but I think you can enter summary info. Be sure to summarize each box correctly and to keep the qualified and non-qualified dividends separate. If you use multiple brokerages, you should summarize one per brokerage firm.
3) If it is a small amount, you can enter the data manually.
I hope this helps.
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