Tax and financial stuff

I have the forms from SARS, but don't really have a clue as to how to fill them in. Also I tried to use GnuCash to do my book-keeping, but failed miserably.

Luckily I have found a small operation of an accountant and admin person and they do personal and business tax and financial management. The thing is I am too small to use their services for invoicing and month-to-month books, so I got to get the right book-keeping software, and use it.

Any advise or opinion on what accounting software is best?