First, tell us what you want and give us what you have. 

Then, we will tell you detailed information about the specific wheel size. 

Next, we talk about the price. 

Finally, come to an agreement.

or 

First, we give you catalogue for your reference. 

Then, tell us which steel wheel size you are interested in. 

Next, we discuss the terms about the product, price, payment and packaging. 

Finally, come to an agreement.