That good feeling, walking with a cup of coffee through the garden, will be multiplied many times when it is your own garden and you are seeing the result of your good planning and hard work. The memory of you mother will live on in your garden.
Gardeners are generous people; if you contacted the local gardening communities and let them know you need plants I'm sure several people will share with you when the time is right for planting.
Don't forget to take photos along the way. We here on ATP are photo-hungry; we love "eye candy" and love looking at other people's gardens.