Analysis first, then plan, as Tookoo recommends. Use native plants, as neotoma recommends. Get specific plant recommendations locally, as Terri & sgelade recommend. Here is my two cents worth, for the shortterm. a. Remove and stockpile the lawn edging and most of the mulch back against the fences. b. Take a can of spray paint, or a bundle of surveyor's flag, and mark the largest circular or curved form that will fit within the fenced areas, no matter where the trees stand (inside or outside of the line) to form the temporary edge of your lawn area. See if the entire family agrees on the alignment or just do what looks best to you as the Senior Gardener. c. Add the wood edging to the new edge, or, it will look a lot better if the edge is not visible, using a steel edge whose top edge is down just above the grass roots and no longer visible, and not an impediment to the lawn mower. (when you form the plant beds, you will dig down a couple inches at the edge, where it meets the steel, and then slope the bed up from there, and the mulch will be contained at the level of the lawn, beyond) My recommendation, after you call in your landscape advisor, is to fill the beds totally with ground cover, beneath the shrubs, so no mulch will be seen after the two years of plant growth, using only a finer textured mulch which will become part of the soil bed. (Maybe the bark mulch will smell good in your new fire pit, along with the wood edging.) d. Plant the entire area with grass seed or sod and enjoy the beauty. The curved edge will make the space appear and feel larger and will decrease the maintenance of the smaller bed areas. On the subject of tree placement: analyse first, then plan. Look at all the views beyond your fenceline from all windows of the house, the living/ dining areas, all the bedrooms, to enhance the good views and to block the big, the bad, and the ugly. The large trees on your list will block views from the upper windows, The small horizontally branched trees will be a piece of sculpture in your downstairs view throughout the year, while their flowering and fragrance yet another reason to be alive. For instance, if you have an attractive small tree that has attractive flowers and foliage, PLUS has attractive bark color and has a sculptural quality in the off-season, you won't have to visit the museum quite as often, with a sculpture garden right out your window.

Consulting a Landscape Architect or designer is going to be time and money well spent. Taking in the location and aspect of the yard. What you and your family want and how you want to use the space for, will help in creating the design. A good landscape designer can be found through you local landscape industry association and will be able to provide a cost estimate to construct the project. Then if you are going to get contractors to quote the work you will be getting quotes based upon the same brief and not random impressions based upon verbal interpretations which can only confuse your decisions. If your going to do this project your self then ask your designer how they would program the works and how to stage construction. Best of luck. Hope to see the finished job !!

Live in Seven Hills NSW. Budget is about $6K to $7K

I would decide what you actually need in a backyard as a starting point, such as a clothes drying area, vegetable garden, sandpit, kids play area, BBQ, outdoor entertaining deck etc. Look at how the sunny spots and shady spots change during the day. Think about the balance between hard surfaces (like decking and paving) to soft surfaces, such as lawns and garden beds. Consider the relationship of the rooms at the rear of the house to the backyard with potential views, and vistas. Consider what is currently over the fence, and what you can do to disguise what you don't want to see (such as your neighbours ugly garage). Also consider if there is redevelopment potential next door that may overshadow or overlook your back garden in the future. Think of the functions of your back garden as a series of outdoor "rooms" and the relationship to each other, and to your house. Your drying area may be in a sunny spot, that isn't overlooked from your dining room, but not too far from the laundry door. If you have young kids you may want to be able to see their play area/sandpit from the kitchen. Locate your BBQ area, outdoor entertaining area which gets the afternoon sun and not too far from the kitchen. Or engage a landscape designer to help you get your thoughts and budget organised. You have lots of scope and opportunities with such a blank canvas. Photos courtesy of Davidson Design Studio http://www.davidsondesignstudio.com.au/ Best of luck, Dr Retro