@Anthony Drew Gary Congrats on starting your journey into real estate investing. The first place to start is the IRS website which has a great resource for detailing rental income and expense https://www.irs.gov/taxtopics/tc414.html . Secondly, you'll want to look at the expense categories on Schedule E, https://www.irs.gov/pub/irs-pdf/f1040se.pdf which gives you the main IRS categories that you will need. If you have any questions about if something should be deducted, write it down and talk to a CPA. I'm always happy to help my clients with quick "is this a deductible expense" questions.
Additionally, @Account Closed brings up a "cost seg". That's definitely an option if you have a more expensive property (I've always heard $250K or more, he may have a different number). The essence of a "cost seg" (or cost segregation study) is that it breaks down the property from just one asset "The residence" which is depreciated at 27.5 years into various 5, 7, etc year property categories. This accelerates your depreciation and allows larger depreciation deductions in earlier years. It works great when used properly.
I hope this answers your questions and if you have any additional questions feel free to ask here or send me a message!