Sorry Jon but there is good reason why fellow traders are not very forthcoming with help and advice to new traders starting out from home base.
If you are unsure what you should be buying and selling your in for a tough ride and should be asking yourself are you doing the right thing. It amazes me how people think that being a car dealer is easy, It's not. The only advice I can give to your question is be prepared to make mistakes and learn from them, from this you will find your answers.