Try to get you models to mimic the real life as much as possible, consider every detail and what its function is. Consider how the two objects fit together instead of overlapping them. Sometimes we can get away with it and it is more cost-effective if we do so, but sometimes if there is a close up shot, we need to consider the details, what to model and what we can escape with a texture. For the rims, it is just a simple extrusion of a cylinder and designing how many times you want to extrude.
Next I will tackle the tires. This is just a simple extrusion of edges from the rims and then extracts the polygon geometry from there. This makes sure that the tire and the rim fit perfectly. For the grooves, you can usually design your own, by extruding in or out, to get the desired shape. You can also model a small part of the grooves and duplicate special around the centre and merge the pieces up together. Use the same calculation method as for the spokes.
For text, Create-Text, I type in the desired text and create it as a poly and quads type. Then, you will have to redirect the edges to make sure it is clean (As seen on U). From there you place it near you tires. It is hard to get it matching perfectly, so use the lattice to help you curve the text into place. Then, simply extrude them to get the depth. Delete the history to get rid of the lattice after you used it.
From there I start to model more of the smaller objects that are in the car. Mainly I start out from a cube, plane or cylinder and it is a matter of moving the vertexes, extruding and adding the supporting edges. Try to make sure that the objects can fit convincingly together.
With the tire finished, I start modeling the car body. I use create polygon tool to shape the outline from the front, than extrude the body shape out according to the image planes. You can extract out separate pieces of the car body after you have more or less extruded all the details out. To extract out circular shapes from a curved geometry, first create a cylinder and delete the faces except for the bottom cylinder shape. Use lattice to shape the cylinder in to place. Extrude and delete the faces than you want to cut a hole in, and snap the vertices to the cylinder shape. From there you can extrude the faces and add supporting edges.
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