They should either be interesting or have something to do with your post.
A little editing can make all the difference.
You can get images that will work from your phone.
How to learn - practice Carry a camera at all times - make a list It takes practice so start taking photos Take a couple of shots. Move around, zoom in, fill the frame. Picture the picture. What do you want it to look like? Look at amazing photography every chance you get.
Learn More No film - keep shooting Join Flickr - looking at great photos is learning DPS - digital-photography-school.com A must read. Scott Kelby books Digital photography 1, 2 & 3. Helpful how to videos on you tube