Given how low the cars are a set of ramps gives very easy and safe access to the underside. I bought a pair of plastic "Rhino Ramps" at Walmart for $30. Sears is ok for tools, the Craftsman series. You can return for exchange anything that breaks or wears out too. I notice they're now selling another line called "Companion" or something. I'm not familiar with them.

You can pick up a set of metric combination (open on one end, box on the other) wrenches, a set of torx drivers, a 3/8 drive" rachet, sockets and a couple of extensions to get started. 1/2" drive is for heavier jobs and I haven't run across the need to invest in a set yet. I do have a 1/2" breaker bar and a few choice sockets I've needed over the years. Take that money and buy 2 sets of metric 3/8" drive sockets. One shallow and one deep. No point getting into the 6 vs. 12 point issue at this time.

These will cover you for most any job. Safety googles are a good idea, at least I wish I'd put them on whenver under a car and grit falls into my eyes.

For the oil change you should replace the ALUMINUM (not copper) washer on the drain plug. Cheap at the dealer and cheaper online if you're placing an order for filters etc.)

Regarding torque wrenches, primary consideration is the range of torque values you'll be dealing with. Wrenches come graduated in inch/pounds, ft/pounds and in varying types. Deflector, Click, etc. A torque wrench capable of 250ft/lbs may not be vary accurate at 12ft/lbs. As an example, my wheel bolts are torqued to 81ft/lbs, the oil drain plug 26ft/lbs. I'd trust a wrench capable of 120 for both.

Anyway, sorry if I'm going beyond what you're asking. Final note, you'll buy cheap tools more than once. Buy the best quality you can afford and keep them clean. Oh yea, NEVER get under a car supported by only a jack. Either put it on stands or ramps. Good luck!
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Erwin in Memphis, '95 855t