When I first got into selling 3d models, I had at least a dozen or so that I offered for free just to get my name out there or get eyeballs on my work. This was probably 8 or so years ago now. However, I quickly realized this was not working out as people were downloading my free models and then reselling them as their own for a profit. So most of the models I originally offered for free, I changed to be paid models. I kept a few of them free but most now are paid, which did seem to curb that abuse.
At any rate, welcome to CGT. Hopefully, you find what you need for your game here. I would recommend learning some basic modeling in something like Blender too though. In just a few months you could have the skills necessary to at least model certain items for yourself, which would save you money in the long run. You might think you don't have the time for that, but trust me, you will eventually find that time you spend searching for free models that may or may not be exactly what you need will take up a lot of your time as well. That could have been time spent learning the basics of some 3d package.
I agree that knowing how to draw is very helpful to 3d modeling, but I don't feel that it is essential. I know of several very good modelers who couldn't draw much more than a stick figure on paper, but they could model hard surface objects with incredible skill and efficiency. Of course, organic modeling (sculpting) is another story. It really helps to have that real-world artistic eye to be able to freehand sculpt an organic shape. The best 3d sculptors using sculpting software (Zbrush, 3dCoat, Blender) all seem to have a foundation and background in traditional media art. Again, it depends on the type of modeling you wish to learn, and how far you wish to progress. In your case, you could learn basic box modeling and make your own props in relatively short period of time, if you dedicate a few months to learning a specific package that is geared for that purpose.