What should my weight be?

hey i am like 5'2, pretty short lol i have asthma, have horses, get exercise, dont eat a lot, eat as healthy as i can, i have lost 15 pound since i adopted my horses, i have a slow metabolism, runs in the family, how much should i ideally weigh? i know i am overweight, and i am trying to become healthier, its hard with my asthma specially in the cold air, but i do what i need to. also if there are work outs i should do that are fun, and work good, i am not in a rush, i am doing this for me, nobody else, i just want to be healthy. so any free videos like on youtube or something that you know of that could help me lose weight, like a dancing or martial arts work out, or even yoga would be cool. so can someone give me a guess on a weight chart for my height? your friend, trish