Perhaps I've been lucky, I just get the normal tax form and complete it using TaxCalc software. Takes me a few hours at the end of year and then submit electronically.
For my accounts, I used to use Quicken, but that was more for home finances, I then swapped to its business partner Quickbooks but couldnt really get on with that, so now I use the basic Sage package. Takes a bit of setting up and getting used to but makes life so much easier for invoices and end of year balances.
Perhaps you could do a part time course at your local college on basic book keeping.