Time to continue the extrusions. The picture shows a cross-section from the top view. Extrude the edges from where you stopped and go in the direction of the red arrow. This will require a number of extrusions to get the shape right.
This is what your rim should look like now.
If you want, you can finish off the back end of the rim but it's not really necessary since it is unlikely to be seen at any time. The picture shows how I did mine. If you decide to do it, you can figure out how to do it from what you have learned so far.
We need to add the little emblem to the front of the rim. This is easily done with a 20 sided cylinder with 3 cap segments and 1 height segment. Position the cylinder in front of the rim and delete the back polys of the cylinder since they are not going to be seen. Flatten the cylinder to make it really thin. Pull out the edges in the cap segments to give it a nice curvature. Chamfer the edges shown in red by 0.1.