Chiflipper is right. Repairs first, then cosmetics. Easy and inexpensive to fix the railing(s). As for the stairs, I would go in this direction for cosmetic changes or really gray treads and white risers.

We actually haven't decided yet. It's been suggested I do beige windows to match roof overhang but I dont know that I like the look of beige windows. Any suggestions there would be helpful. I'm a new Houzz user

Yes to painting the shed to match your house. But do not highlight the white trim. ALL one color. And remove any “cute” embellishments. Your home is modern. The shed shouldn’t look “country.” And Yes to NO Shutters. Finally…trim up the tree but leave it there. Before you sell, ream out any drain lines that might be compromised. (And certify that they are “clear” for the buyer.). Let the buyer decide about the future of the tree…which is NOT that close to the house. Focus on simple basic landscaping in the front and along the walk. Nothing extreme. Again…let the buyer do that. Maybe a pot on the front porch planted with annuals. Mulch with brown mulch, not strange color OR stone. Leave future decisions to the buyer.

You can also hire a qualified and experienced landscape designer for either an onsite consultation or to develop a planting plan that you can DIY at your convenience. This is a very affordable option, rarely costing more than a couple hundred bucks and should be considered an investment in your property rather than just an expense as it will save you the expense of trial and error plantings and can increase property values. Online design sources tend to be expensive for the value provided and judging by the amount of negative feedback they receive in this forum, are rarely very successful or well received.