When you're first starting out, steal everything. Use presets, copy tutorials, copy your favorite song's structure, all that stuff. You can't come up with something better than that yet, and that's okay. You'll learn. It takes a long time though. When you've copied a whole ton of other people's stuff you'll realize what makes it work and you can start utilizing that knowledge in your own original ideas, no longer stealing.

Basically don't try to be all high and mighty and design all your own sounds from scratch and all that, you're just reinventing the wheel.