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I assume you mean that you used a Miracle Grow potting soil mix, along with some leaves.

This soil mix is generally used for potted plants or container gardens.
Leaves are beneficial in the garden, but generally should be composted properly and then added as organic material to the garden.

Yellowing leaves can indicate watering issues; too much or too little.
The plants are likely not getting enough nutrition from the planting material that you are using.

It is still early in the season to make adjustments to your raised bed and the soil you are using.
Here are some articles that will help you.

https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-garden-soil.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-gardening-for-beginners.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/starting-vegetable-gardens-guide.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/fertilizer-options-for-your-vegetable-garden.htm
https://www.gardeningknowhow.com/composting/ingredients/composting-leaves.htm

https://www.gardeningknowhow.com/edible/vegetables/vgen/raised-vegetable-gardens.htm

You can use a metal mesh or hardware cloth at the bottom of the raised beds to keep any critters from tunneling under the garden bed.
I personally do not have an issue with tunneling animals in my garden, and skipped this step.

I would avoid using the cardboard at the bottom of the bed, unless you use the 'lasagna method' in the raised beds.

Here are some links with more information.

https://www.gardeningknowhow.com/edible/vegetables/vgen/raised-vegetable-gardens.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/lasagna-gardening.htm

https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-garden-soil.htm

There are gardeners that claim success with growing in pure compost, but a good rule of thumb is about 30 percent compost to your soil.
Your compost may have too much nitrogen and you will end up with lots on nice green plants and no tomatoes on the plant.

https://www.gardeningknowhow.com/edible/vegetables/tomato/tips-for-growing-tomatoes.htm

Wind can break or strip the small seedlings of all of their moisture.
Keep them in a sheltered location and wait and see.

It happens to the best of us, try not to stress too much! Remember, a loss in the garden is a new opportunity--like another visit to the garden store!

https://www.gardeningknowhow.com/garden-how-to/seeds/how-to-harden-off-your-seedlings.htm

It is best to have a soil test done, this avoids guessing what the soil needs and avoiding spending time and money on soil amendments or fertilizer.
Your local County Extension Office can help you with a soil test.
Here is a link to help you locate your closest office.
https://www.gardeningknowhow.com/extension-search

Here are some articles to help you get started with your vegetable garden.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-garden-soil.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/fertilizer-options-for-your-vegetable-garden.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/starting-vegetable-gardens-guide.htm

This certainly can vary between the plant types and varieties, but in general, but plants in opposite ends of the garden.
It can be as simple as a row between warring plants.

https://www.gardeningknowhow.com/edible/vegetables/vgen/incompatible-garden-plants.htm