1. The ideal pH for growing blueberry plants is 4.5-5.5. Elemental sulfur application yields rapid results compared to nitrogen fertilizers. You can apply elemental sulfur in a narrow band under the drip line of the bush, no more than 3 oz per plant at any one time. Make sure the elemental sulfur is mixed properly with the soil. Keep the soil around the plant moist but not wet. This can be done any time of the year, but better in the fall. 

2. First, I would recommend going with the soil test report. If you do not have soil test information, before transplanting, use one to two pounds of 10-20-10 or similar fertilizer for each 100 square feet. All fertilizers should be worked into the top six inches of soil. Tomatoes prefer a fertilizer low in nitrogen, high in phosphorus, and medium to high in potassium. Since the soil pH is 6.7 in your tomato bed, applying gypsum is a good idea as it is pH-neutral and it helps prevent blossom-end rot.