There are a few things that you can do to receive free things.
1)NorthernWoods
Here you can three different types of slime. Radioactive, SuperRadioactive, and UltraRadioactive slime.
You can either feed this slime to your pets or, take it to the slime compactor and sell it. If you feed it to your pet it will increase their strength. You'll need to increase their strength if you plan on fighting them in the training arena. You can do this quest every 3 hours. Also, if you do sell it. Below is the price list for the slime that your selling.
This is another quest that you can do every 3 hours. Padams Shack. Here, you can rare stuff and not so rare stuff. You also can get powerbucks, armor, and job cards. Things that you'll need on your way to becoming elite.
But remember. You can only go every three hours. If you go before then. Padams' dog will attack. So be careful.
3)TheArmory
Well, this isn't really a freebie but it's where you go to get your pet's armor incereased. Before you can fight in the Arena. You'll have to have your pets armor up to a level 9. There are 4 different types of armor that you can get.