Used Car Prices

All the variables above are ratio variables (Numbers are used) except the makes of the cars, because that one is special and it's called nominal variables.
I will first try to find out any links between the current price of the car and the other variables such as age, mileage, car engine size, and the make. After finding links, I will then attempt to progress the data in order to find out stronger links between variables and eventually I will try to find a general value or formula that can link them. I will be drawing some graphs and then look for conclusions, which can help me to find a general formula.
Hypothesis:
I predict that all of the variables will affect the Price of the cars in anyway, because they all are very important. So I think the Age will affect the price most, because it is the most important variable of all and I think the Engine Size affects the least, however all the variables will affect it in some ways.
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