https://www.northerntool.com/shop/tools/product_200327487_200327487
Crawl space ventilator fan
Crawl space ventilator fan
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Look under there during a rain and see where it's coming from. Get the water as far away from the house as possible from your down spouts. Positive drainage helps but the dirt is a sponge that holds the water against your house. You should be able to do this on your own I would think. Before you cover it put some fans under there to dry it out as much as possible before you put down the poly. If there is a lot of water you might need to put some sort of french drain under there to get the water out, if it's just damp under there this shouldn't be needed. You should be able to do this for under 1k
Make sure you get a whole house (not the single room) Dehumidifier. I installed dehumidifier and it totally changed the environment of my house. I also closed off the foundation vents at the advice of an engineer. Encapsulate the dirt, redirect the water and you will be 'golden"....I was planning on doing complete sealed and adding a dehumidifier. Try to do exactly what they were going to do for 1/4 the price.