How do I acquire assets??

I'm only 21, but me and my dad have our own business, I don't fancy the idea of working for someone else. So, I know that I have to acquire assets and limit my liabilities. But, I know like a washateria would be a assets, but being 21 and with little or no capital, how would I go about acquiring an asset to put some money in my pockets. What types of assets are there?