I’m certainly no level designer but I did catch a talk that Christopher Totten did at ECGC a few years back. He did a really detailed article on concepts of level design. It’s a long read but it’ll give you some good ideas for your levels! Take a look and see if it helps you out!
Christopher Totten: Designing Better Levels Through Human Survival Instincts
If your not in the mood to look at theory and concepts just have fun putting levels together with some basic shapes using the BSP tools for prototyping. Once you get something that feels right start replacing those with your static meshes.
If you’re not familiar with how Epic does it’s level design check out the Content Examples project from Marketplace and open the map “LevelDesign_workflow.” You’ll see how we use BSP for prototyping and then move to replace with assets as we finalize the level.
Let me know if you have any questions or need pointers! 