Hi @ExploreFY,
Welcome to the community.
Just like Emily said it would be very helpful if you could let us know the version and edition of the QuickBooks you are using.
Since you want to import items to your Quickbooks the following article will prove useful -
https://community.intuit.com/articles/1458771-import-or-export-list-data-in-quickbooks-online
As for maximising deductions to minimise your taxes as we do not know much about the nature of your business I can only suggest a few more articles like the ones below
https://www.irs.gov/credits-deductions-for-individuals
https://www.irs.gov/help/ita/deductions
https://www.irs.gov/taxtopics/tc500
I hope you find this helpful. Let us know if you need any other information. Out here we are only eager to supply that. :-)