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If at all possible, you will want to remove as much of the stump and roots as possible. This will make your soil usable much faster. You will want to condition the soil by digging in dolomitic lime, and good organic material. Otherwise, it could take a year or tw for it to degrade far enough to plant around.

This may be the time to replace the shrubs.

Make sure you have planted the tree so that the root collar should is about two inches above the surface. While the soil is still loose water the tree, then tamp down lightly. Apply a three-inch layer of organic mulch, leaving a six-inch clear space around the trunk.
During the first growing season water the tree deeply once a week, and keep the area round it clear of weeds. Once it’s been in the ground a few months its root system will soon be large enough to keep it supplied with water and nutrients.
https://www.gardeningknowhow.com/ornamental/trees/leyland-cypress/growing-leyland-cypress-trees.htm

A consistent water regimen is needed following planting in order to ensure that new plantings remain healthy and adjust to their new planting site.
Make sure soil is well draining.

The article below will help refresh the planting and care information.

https://www.gardeningknowhow.com/ornamental/trees/leyland-cypress/growing-leyland-cypress-trees.htm

The yellowing is likely watering issues along with plant stress.

A consistent watering regimen is needed immediately following planting.
Daily watering for the first few weeks and then you can taper off.
Add mulch to aid in moisture control and help keep the roots cool.

Make sure your soil is well draining. These Cypress do well in most soils as long as they are not wet.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-well-drained-garden-soil.htm

Here is some planting advice for your new Leyland Cypress.

https://www.gardeningknowhow.com/ornamental/trees/leyland-cypress/growing-leyland-cypress-trees.htm