You definitely want to have your transmission and diff fluid changed, on a street driven car they should be changed every 60k miles or 100k kilometers.
You REALLY need an oil change. That's very important and like @
humfrz said, you can go get that done even at a half-ass decent quick lube place in under an hour, then consider the rest.
Maintenance is largely about inspection. Here in my city we have a DIY garage with mechanics who work in it as well for much lower shop labor rates than any dealership (usually half or less). You should really familiarize yourself with your own car. If you have a local DIY/hobby garage, you should call them on the phone and see if you can schedule to come in for 2 hours which should give you enough time to do an oil change and have them help you learn how to inspect everything else and then ask if they can do the diff and ATF change for you if you don't want to do it yourself.
Every person ought to be able to do an oil change on their own car, and contrary to the lies a service advisor at the dealership will tell you it in no way can impact your warranty coverage in any civilized country.
Given all the items in the list, the ones you should absolutely have done (roughly in order of importance for safe operation of the vehicle):
* Brakes (whatever is necessary)
* Oil & Oil Filter Change
* Tire tread depth check and pressure check (you can do this in your driveway, and should do it regularly anyway...)
* Diff Fluid Change
* Trans Fluid Change
* Spark Plugs (if they need it).
Don't neglect your car, and don't pay stealership prices for basic maintenance. You can probably have a local shop do everything for you for less than $400, including spark plugs.