Question:
Where can I get case law info regarding personal injury lawsuits? A box fell on my head at a local department store due to negligence of a store employee

Answer: Where you can get caselaw is in the case reporters for your state (which you fail to identify). But the real questions are

- why on earth do you think you're capable of representing your own legal interests on the basis of informal research?

- why wouldn't you seek the advice of someone professionally trained in the law, esp. when injury lawyers are widely available and commonly work on contingency (meaning they only get paid a percentage of your recovery, not an hourly fee)?

Your query makes the tacit assumption that the store employee was "negligent". It might be a good idea for you to consult with an attorney likely to appreciate the complexities of that term, which (as a legal term of art) carries an enormous amount of meaning.