If you are a newbie, start small. A whole Web framework is quite a mammoth task that can become quite complex, at several levels. (Just look at the feature list of Flask to see what I mean.)
Look at existing Go Web frameworks or toolchains, to see how they did it. (Buffalo comes to mind.)
If you are new to Go (and more so if you are new to programming in general), start with a small, simple, and narrowly focused project, to quickly get a first success. Then extend your project, or add other small projects, to steadily approach your goal.