Hi KENMO
I also use Moi, 3d coat and Rocket and agree with Marco that they are a good combination. I'm also an amateur that started later in life. I have made a few vehicles with Moi but its not always easy. There are various approaches to take. Lofting using LOOSE and EXACT can create smooth organic shapes. There is also a subd script that will allow you to make car body shapes. Finally there is the option of blending and networking which, to me, seem to offer the best results it is difficult to visualise how to create the edges to network. I'm no expert but have managed to make a few half decent models using Moi so its certainty possible. Maybe if a few of us attempted to model the same car we could learn from each other?
Best wishes
Keith