The first and foremost thing if you want to write good poetry is to read a lot of them. Trust me, you will learn a lot of new ways to write one. Try listening to poetry sessions. While writing, never stick to the first line as it is just the component of your poem. Sometimes, sticking to your first line may block your ideas as well. Try to tell a story through your poem rather than just writing it. Try using simple yet deep words to make it look more beautiful.