Cleaning and conditioning are definitely important and will keep your flats and jacket looking nice. Right now, I’ve been using Coach cleaner and conditioner (I got them cheap at the outlet store), but there are a lot of good products out there that are cheaper. I would go to a shoe store or Nordstrom and ask what they recommend. Products for jackets may be different the ones used for shoes. Make sure to bring the shoes in with you, because different types of leather require different cleaners.
As for discoloration and water damage, try not to wear the shoes when it’s pouring. Usually water stains in leather eventually disappear, but it can take a while. If the shoes or coat get completely soaked, like where even the inside feels wet, don’t wear them until they’re completely dry to prevent them from getting misshapen. Also, if they’re wet, don’t put them in your closet as there isn’t enough airflow and they may get musty from being wet too long. Your best bet is to put them out in the open in a warm (65-75 F) room and just be patient!
As for repairs, I would look on Yelp. I think a seamstress would do a fine job replacing sequins and beading. I’m from Seattle, so if you are too, I may be able to make some recommendations :)posted over 1 year ago