hello, I went to tax accountant and I was told if I make/ show more money on my tax return the more returns I get back? Is this true?

my situation: first time filling taxes,v small business owner and a cash business. I have 2 dependents, single mother
I have never filed taxes before so don't how do you file taxes return, thus I went to tax professional but I am more confused now then I was before. if anyone could direct me how taxes are done, what you need to be prepared with and documents you need save & to give to your tax pro. And what type of exemptions am I entitled too. I would really appreciate your advice and help

thank you for your time