You are on the right track.
But, instead of having a pool store test for you, it is better and likely to be more accurate, if you do the testing yourself. The test kit that we think is by far the best is the Taylor K2006 or 2006C (better buy). Not available locally but you can get it through this link that takes you to Amazon: http://pool9.net/tk/
But, in the meantime, go to Walmart and see if they have the HTH 6-Way drops-based kit (no test strips!) and get that. If they don't, get an OTO/Phenol Red kit (yellow and red drops) instead. Use it to test and then post your numbers. Then someone here can better advise you on next steps to take.
Also, tell us what size of pump you have and what size your sand filter you have.
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