Do you have an idea of what you are looking for? Are you aware of what is required? Two very distinct questions that require distinct solutions. Whatever your budget, you'll need to be clear about this. You'll need to come up with your list!
The more comprehensive Your Designs Brief will be, the easier it will be to design appropriate designs for your home. Some prefer to keep their design briefs very loose and leave it up to the designer to magically find the perfect layout.
The existence of a great Design Brief doesn't mean you must create a plan for it, that's the job of the designer! However, feel free to show your creative flair when you're looking to start making a strategy. You can look for the best custom design for your home via https://www.honorbuilthome.com/.
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Sketches of thumbnails are great! There is no expectation that you are an architect. It doesn't require a plan to be scaled but it's important to get an idea of the kind of space you'll require. A bubble diagram labeled with circles for rooms can be a great start.
Your plan should include the following basic elements: Room types size, room sizes, vehicle accommodation, how you would like spaces to connect, overall budget, size of the house outdoor areas, etc.
Incorporate the "wish checklist" items, but remember that your budgets will determine how much you can incorporate into the final design. Remember that designers are typically visual, so the more images you have to convey your concepts the more effective.