If you go through the mentor program, you will be an advanced reviewer upon graduating, get great advice on review writing and have a new friend on the site. Or, you can request an upgrade where the other members of the site vote on your reviews and possibly advance you to an upgrade.
You can become advanced one of two ways. You can either write two reviews and go up for community vote or you can do two reviews with a mentor. When you graduate the mentor program you will automatically become advanced.
I would recommend the mentor route. It helps improve reviews and thus ranking overall. The higher your rank, the higher the price of the free toy you can select.