Wrong. Facepunch is more apt to help people that make their own content and those who type out well written posts.
That being said -
Get some reference pictures op. Just for practice, find a picture of a decently detailed building or structure and make it in hammer to the best of your knowledge. If you’re not going for a fantasy map, real world building construction usually fits well for CS:GO.
I find one of the biggest things is good textures. Good textures can do a lot of work for you instead of immense brush detail. Also be sure to add some variation in your texture usage. Don’t use the same 5 textures over the whole entire map…unless they blend well of course. Good models with proper usage works very well too. It can add a lot of detail to your map in a short amount of time and effort.
Practice, you’ll git gud eventually with persistence.