The easy option is to try bottled marinades found in the supermarket.
If you want to make your own, there is practically no limit.
A marinade should include a fat, usually an oil, an acidic liquid such as vinegar or wine, seasonings, herbs, spices. e.g. olive oil, red wine vinegar, crushed garlic, rosemary.
You can also make marinades with dairy such as buttermilk or yogurt.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan