Unless you plan to try out carpeting plants, the gravel you have should be fine in my opinion. The suggestion to plant in containers is a good one. If you use organic potting soil, you won't need to fertilize for ages and plants love it. Optionally you can use root tabs or liquid ferts and keep things as they are.
Some of those non-aquatics will last a few months until you can get more plants. I did the same thing when I started.