I want to say that writing isn’t hard, but that is not exactly true. Much like a book I read about the thinking and ideas, it takes time to truly think of something good. Those who just thought of something for a brief second and give it out as a good idea will often see their ideas failing and falling apart, and at best just coming out mediocre.
If you are new to writing the best thing I can tell you to do is to read; as the ideas of great writers and works are often a good start to know what you want to write and how you want to write. Personally I have copied the style of writing of an editor of a local newspaper in my town, and have grown my own style inspired from it.
As for tips as a writer Our friends from Writer’s Digest wrote an interesting article about it here.