Here's an easy way to open casebacks: packing tape. Ball it up with the sticky side out, push onto the caseback and twist. Just don't use it on any medallion with paint. If you buy a caseback wrench, get the 3 pronged one and take you time adjusting it til it fits perfectly in the notches.
You should get a decent springbar tool with replaceable tips. One side with the fork, one with the flat topped pin.
A digital caliper is good too. Pittsburgh tools item #47256 can be found under $20 and opens to 4", although you won't need more than 2" for watch related stuff.
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