someone talk me through cleaning leather jacket?

Not in the washing machine, whatever you do. Wipe the outside with a damp cloth and a small amount of mild soap or saddle soap, working a section at a time, then go over it with a clean damp cloth and dry it off. The lining can be spot cleaned. For smells, a light mist of half vinegar half water inside the lining and hang it somewhere airy. Dry it on a wide hanger away from radiators and sun, then condition it. If it's suede or has a big stain, take it to a cleaner that does leather.