Yea buddy, if you want to make a map, you will need to improve, and mapping takes time, not a couple of hours, and the amount of time you spend on the map will be reflected in it's quality. Take a look at maps in most any map pack, expansion, or the core game, they are detailed, full of paths and rooms, and make use of multiple textures along the way to improve the overall look of the map.
I suggest heading on over to the
Tutorial Collections and checking out some of the mapping related ones, I suggest starting with Rozark's (it's pinned) since he is a great dang mapper.
Also, if you are truly passionate enough to wanna become a mapper, maybe even get in touch with other mappers and see if they have any pointers they could give you.