Recruit followers (Quest)

You have to talk to delphine after doing alduins wall and speak to her and you will see something that is similar to this, there are only two of you and she will respond by telling you they are being hunted it isnt easy to recruit and then you can choose to bring followers for example lydia and they will become a blade then esbern will then give you locations of dragons and you and the blades you have recruited will fight this dragon together and keep going to esbern ocassonilly to recieve locations.