1) I found the majority of my initial objects at a large antique mall. I spent several hours touring through the various booths adding things to my basket that I absolutely loved! If you choose to do this, I'd suggest bringing snacks (I brought chocolate, haha). Sometimes sorting through the many antiques and thrift items can get to be a bit overwhelming. Snacks can keep your tummy satisfied and your focus sharp so you don't walk away with something you don't really want!
2) Next, look for similarities in objects (shapes, colors, patterns, etc.). This helped me distinguish what pieces went with others. Remember, you want your wall to look and feel cohesive and we achieve this by having objects that slightly "match" with similarities. For example, I chose these 2 large serving trays because they both had similar patterns and were the exact same size and shape. When placed on the wall among the other objects, they bring a heavy influence of balance especially when placed opposite of each other. This brings me to the next tip...
3) If you buy your first couple objects all together like I did, before you make your purchase find a spot in the store to create a preliminary arrangement. I chose to use a large dining table that was for sale over in the furniture section to lay out all my items. This helped me visualize, as if I were at home, what the objects would look like altogether on my wall.
Hope you enJoYed!