Hi Gabriela! looks like you are in the same hardiness zone as we are. (-20 to 40c).
The only free program(s) I can think of that have the power and capacity to create maps for landscape architecture is a combination of
Google Earth
http://www.google.com/earth/
Google Sketch Up
http://www.sketchup.com/
Here is a website I used to learn about how to do this:
http://www.arch.virginia.edu/computing/training/online/faculty/stiles/pages/sketchup%20new/sketchup_google_earth.html
You have to download it to your computer. You can always use a good old fasion pen and paper. That is my prefered way to start out. There is perhaps no better way to understand the ins-and-outs of a piece of
land that to map it yourself.
What trees could I use for the back that would create a bit of shadow and not attract too many bees?
First off, Why do you not want to attract
bees? how else are you going to get your garden to flourish without them?
It really depends on the size of the space you are working with, and what kind of yield you desire out of them.
Apples, Pears, Plums, Quince, Mulberry all come in a variety of sizes to suit your needs.
Some relatively small trees/shrubs include Hawthorn, Serviceberry, Sumac, Elderberry, Silverberries, Seaberry
Maple, Oak, Alder, Beech, Birch, Hazel, Willow, Bamboos are all pollinated by wind (hence, no bees)
What type of trees could we plant in between the pine trees?
Here is a list of plants, hardy to your area, that are tolerant of acidic pine needle humus
Achillea millefolium Yarrow
Actinidia arguta Hardy Kiwi
Adiantum pedantum Maiden Hair Fern
Alcea Rosea Hollyhock
Amelianchier alnifolia Saskatoon
Amphicarpaea bracata Hog Peanut
Apios americana
Groundnut
Aquilegia canadensis Canada Columbine
Arctostephylos uva-ursi Bearberry
Asarum splendens Wild Ginger
Borago officinalis Borage
Caragana Arborenscens Siberian Pea-Shrub
Castenea mollissima Chinese Chestnut
Cornus avellana European Filbert
Diplotaxis spp. Arugala
Eleagnus mulltiflora Goumi Berry
Gaultheria procumbens Wintergreen
Gaylussacia baccata Black Huckleberry
Helianthus tuberosus
Sunchoke
Lespedeza bicolor Bush Clover
Lupinus spp Lupines
Malus baccata, Malus ieonsis Crab Apples
Monarda didyma Bee Balm
Monarda fistulosa Wild Burgamont
Panax quinquefolius American Ginseng
Polygonum biflorum Solomon's seal
Ribes nigrum Black Currant
Ribes hirtellum Smooth Gooseberry
Robinia psuedoacaccia
Black Locust
Ribes Spectabilis Salmonberry
Vaccinium spp. Blueberries
What herbs could we plant to keep away ticks from that area?
Strongly scented herbs such as Garlic, Rosemary, Yarrow, Sage, Lavender , mints will all have a tendency to repel ticks.
Conyza spp of asters are also said to repel ticks. But the best way I've experienced to control ticks is to keep a couple of Guinea Fowl around. Pretty much a total ground-dwelling tick control over a relatively large area. Then there are ticks that like to live on trees....