Want to start getting in shape

I'm skinny but definitely not in shape. I'm just naturally skinny and would love to get fit. Any suggestions for a workout for someone who's never worked out a day in their life 😂 I know that sounds bad but I just never saw a need. I have asthma and would love to do things without getting out of breath. And no working out doesn't make me have an attack, getting hot does. I'm 5'5 and 135 pounds. Any help would be appreciated :)