Okay i need some advce about writing this book?

okay i love to write. Iv'e always been very creative but for some reason im having trouble with it. :/ i mean im pretty good but like im having trouble putting enough details into my books. I wanna put alo of detail into this one and i want to have a better sense of my charector. so if you can help me with any of these that would be great? also how do u get rid of writers block?? thank you for ur help.