Just start small. You don't need to start a full blown garden if that seems daunting. Just plant a few seeds, see what grows and what does well. Then next year you can expand if you can handle it and you have the experience from what grew well the previous year. Also I wouldn't really bother with fertilizer to start, just plant the seeds and just water them depending on the weather (don't need to water them if it rains).

Gardening is just like any other skill, you start small and basic and expand from there as you gain more experience and skills.