Do you realise that even though you are only a one man operation, you are still woring for a pty ltd company, which is a sperate legal entity to yourself, and you will need to;
Register for PAYG Witholding (ring the ATO on 13 28 66).
Complete and mail off a tax file declaration (you can get them at Australia Post).
Complete a Superannuation Choice Form (you can print them off from MYOB Menu Bar – Setup – General Payroll Information) .
You will need to keep copies of these, in case you are ever audited.
It is also recomended that if you do employ someone, you get them to sign a form saying that they have recieved a superchoice form from you, they are under no obligation to return it to you, but you are under an obligation to give it to your employee.
As a sole trader, you can not employ yourself so a lot of these requirements do not apply to you.