That will depend on how much light the area gets.  I’d suggest observing the are and then take a visit to the garden center to ask questions and read labels to see what is appropriate size-wisw and light-wise.  Be aware that all the perennials will not be available at one time but arrive as they come into flower throughout the growing seaseon.  Right now you”l fine early-flowering perennials and other will appear when it is their turn to flower.  A few visits throughout the season is a good idea so you can have a variety that will provide color all summer long.  There are literally thousands of options.