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I would not reuse potting soil for starting seeds. Fresh potting soil will work better and eliminate any chance of bacteria or other contamination that may be present in your old potting soil. I put my used potting soil into compost, or sometimes dig it into my garden beds if I"m sure it's clear of problems. Here's an article about how to sanitize your potting soil:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/sterilizing-soil.htm

The best soil has a mixture of organic materials and compost. However, different crops have different pH requirements, so be prepared to do some soil testing. This article will give you details:
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-garden-soil.htm

As to fruits, it depends on what kinds of fruits you're planning. Look up on our site any particular plants you need info on, or send us another email when you know for sure.

We don't do soil samples but your nearest extension service does. Here is their contact information:

https://www.gardeningknowhow.com/extension-search?zip=+15216+&radius=10&extservsearchaction=search&submit=Search

No, I would not recommend sprinkling soil on food in any amount.

Here's an article with the info you need:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/best-soil-raised-garden-beds.htm

No, we don't sell products or services. We do, however, provide free gardening information. You are wise to test your soil, blueberries need very acidic soil and it is difficult to maintain acidity by adding amendments.

You can get a soil test done at your nearest extension office. Here is how to find them:
https://www.gardeningknowhow.com/extension-search

https://www.gardeningknowhow.com/edible/fruits/blueberries/growing-blueberry.htm

https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-yellow-leaves.htm