There are online templates you can follow (https://www.google.com/search?client=opera&q=landscape+contractor+estimating&sourceid=opera&ie=UTF-8&oe=UTF-8) but I have no idea how accurate they may be or how they factor in regional cost differences.

Otherwise, my suggestion would be to find someone local in the industry that can provide you with a breakdown of what the anticipated costs for various aspects of the landscape may be.

But unless you have a defined landscape plan that you can properly cost out, you will just be guessing regardless of what expenses you may plug in.

Thank you for your wisdom.

Start with a landscape plan and price it out as line items sortable by feature e.g. deck, pool, perennial bed (include hardscaping, softscaping,

build, installation, maintenance).