As I mentioned above, you have the option of using a piece of 1' x 3' lumber for the installation or building a frame to support the cabinets (I have included a picture of a sample frame below). This can be made out of 2' x 4's and should be tall enough to support the bottom of your wall cabinets. If you plan on installing more than one kitchen, then I would suggest the frame, but a piece of lumber will do just fine if this is a one time event. In either case, you will need another set of hands to help with the installation.
White can be used in combination with any color. Though white alone can look great too but if another color is used in combination then it can be further complementing for the kitchen. Pale green would be perfect in combination with white.
When you are purchasing the kitchen cabinets online then you can find discount kitchen cabinets too. If you are of the view that discounted cabinets will be poorly made and they will be of poor quality then you are wrong. Even if you purchase the second hand cabinets, they will be a great way to save money. You can get them painted, repair them or change a bit of their appearance to give them an improved look.
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