You are unique. Devise a style for yourself. Topic can be mundane but the way you narrate it should be honest to your feelings. Ofcourse you won't be able to write splendidly at get go.
But with practice you will get better.
The stronger a light shines the darker are the shadows around it.
Reading quality books is also a best choice. There are several authors who write in good language.
1)How can I be a good writer
You should sit-down with experience writer to get some information or you should at least Communicate with them to get some knowledge about it. apart from you should think by own and whatever you write it should be yours skill.
You just simply pic some topic from your daily life and start writing about it like that way you can improve you writing skills and you will become a Good Written.
By Determination one can Accomplish anything