There are too many things to pay attention to, which cannot be explained clearly in a few words. Here is a calligraphy website for you.
/system/2006/05/09/00 12985 17 . shtml
Tian Calligraphy Lecture Video Collection-Calligraphy-Northern Network-Culture and Entertainment
Although this lecture is not a pen, it can be read, which is very good.
If you practice every day, you will get better in a month. Whether your writing is good or not depends on your persistence.
There is a good forum, China Pen Club Forum. Study hard.