How do you recruit all character in dragon age origins

alister-will join near the beginning automaticly
morrigan-same as aliter
leliana-in lothering their will be an inn where you fight some people and the she will talk to you and you have to ask her to join
sten- he is in lothering in acage. talk to him and ask if you can free him. go to the chantry and ask the revered mother to give the key to you then go unlock his cage
wynne-during the broken circle quest you will meet her and shell join you
dog-if you do the human noble origin you will get one, but if you don't then when youre in ostagar their will be a kennel master he'll ask you to muzzle him so do that and he'll ask you to get a flower while youre in the wilds its kinda hard to miss so look around. go back and give the flower to him then after the battle of ostagar he'll come to you in a random encounter
oghren-during the paragon of her kind quest he joins automaticly
shale-downloadable content (dlc)
zeveran-fight him in a random encounter and spare him