Yes, you do need to get permission for most quotations written within the last thirty years, though a certain amount of prose in context is allowed. Go to the Society of Authors at
http://www.societyofauthors.org . (I think), they will give you the precise info. If you end up with a small publisher they will not have a legal department, but I understand that permissions are the author's responsibility anyway. I had to get to get hold of 8 for my one published novel. It was fiddly and took time, but because the print run was expected to be small, nobody charged me for using the extracts. Good Luck, Hilary