Warm colors such as oranges, yellows, and reds will go well together, while purple, scarlets and dark greens go well together
Pops of colors compliment and balance darker tones and overwhelming amounts of one color
Use varying sizes of plants for levels and added interest
Space out perennials and have annuals in between, so you have the ability to switch up colors and styles yearly, without replacing everything
Mulch around plants deters weeds and can provide a more professional look
If you have issues with bugs, a mixture of dish soap and water sprayed lightly over the leaves may help prevent attacks
Look for how much sun a plant needs