A local garden store or designer will certainly be able to help you. In the meantime, you can look up ideas online, but you'll need to know some basic information before anyone can help you choose specific plants. The first and most important is to know your planting zone, which is all about your location and climate. You also need to know the directional orientation of your house and the wall, and whether it is "full sun", "partial sun", or "shade". Will you be planting on both sides of the wall? You may wind up with vastly different plants if one side gets full sun and the other is in the shade. Take into consideration whatever shade is cast by the large tree, and the house itself. If you have the time, spend a day taking pictures of both sides of the wall - maybe once an hour (shadows will shift somewhat throughout the season), so you may want to do this every few weeks and keep a visual log of how the shadows move. Also, before you plant, decide if you want to paint the wall. It will be easier to paint before you plant, of course. White will reflect heat back onto plants. Climbing plants would look nice on the wall, if you're not going with a very structured garden. Ivy is an obvious choice, but there are other vines that flower beautifully, if you like that idea.

Since it's a tiny shed i'm assuming "bikes" = bicycles. Don't know height of shed, this might work for you. http://www.wayfair.com/Gear-Up-Inc.-Platinum-Series-Floor-to-Ceiling-Storage-Rack-33015-GUPI1022.html Is the mower electric or gasoline run. If electric can be hung in a silimar fashion and garden tools too. The whole idea of course is to have a lot a floor left to house wheel barrow, riding mower, and just other stuff that weighs to much

You can get feedback from a local nursery. My garden is 15 years old. I've planted what is pretty and now know what will grow and what won't! I have a peony garden, hydrangeas/ hosta on north side, catmint in dry areas. If you like to garden this is an ongoing process! If you just want to plant and move on, think low maintenance shrubs, dwarf lilac, hydrangea, and boxwood.

Wood fence maybe? That's the only thing I can think of.