Hello,
First of all thanks for choosing our Theme, we are glad to be you in WoodMart WordPress family :-)
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As you want to create variable products with different variations so that a person can choose different options and then add that product to cart and so on.
To do this. First of all you need to add attributes for your products from Products >> Attributes.
Then create a new product from Products >> Add New and select variable from products options and then add attributes and their variations.
Screenshot for clarification: https://jmp.sh/k0eCZOp
Also you can read and follow the below documentation for in depth guidance:
https://xtemos.com/docs/woodmart/variable-products-swatches/
Best Regards.