Before your first hire, decide what you will manage
A first employee changes your own role. Work through a customer assignment to see which management responsibilities you are choosing.

You have more client work than you can comfortably deliver yourself. Hiring someone could let the business take on more of it. As you describe the job, I would also describe the work you would take on as that person's manager.
Choose a customer assignment you know well. What would the employee be responsible for producing? What would they need from you to do it well? Your answers can help you judge whether you want the role that hiring would create for you.
Work through a customer deliverable
Imagine a small consultancy whose owner prepares research briefs for clients. The owner is considering hiring a researcher to prepare a first draft. Take one brief and describe the result the client needs: what question should it answer, and what would make it ready to use?
Then describe the handover. The researcher might be able to find and assess sources independently. They would still need to understand the client question and the depth of work agreed. Who explains that? Who decides when a request falls outside the assignment? Who reviews the first draft before it reaches the client?
Write the employee's responsibilities beside your own. Be specific about the support you expect to provide. 'Review the draft and explain which conclusions need more support' gives you a clearer management task than 'make sure the quality is good'. It also gives the employee a clearer idea of what they can expect from you.
Separate learning the job from continuing management
In the research example, a new colleague might initially need a completed brief to discuss with you. You could explain why you included some material, left other material out and stopped researching when you did. What they need to learn will depend on the person you hire and the experience they bring.

For your hiring decision, consider who would provide that introduction and how they would make time for it.
Some of that work should change as the person learns the business. Other decisions may continue to need you. An experienced researcher could produce a strong draft and still need a decision about a client's request to change the subject. You would need a way to discuss that request and give direction while the work can still move forward.
Mark which support belongs to the initial learning period and which you expect to continue. Where you are unsure, leave the question open. Do not build your plans around an assumption that the person will eventually need nothing from you.
Decide which management work you want to do
Now look at your side of the proposed arrangement. Would you enjoy helping someone develop their judgement? Are you willing to explain a standard, discuss work that misses it and follow up on what changes? Those conversations would become part of your own work.
Think through a moment when the two roles compete for your attention. In the consultancy example, you might be in client meetings when the researcher needs a decision before continuing. How would that decision get made? If your plan is to handle it yourself, where would you make room? If someone else would help, name the responsibility they would take on.

You may want to become that manager and need to change your current commitments to do it well. You may also discover that the management role would occupy more of your attention than you want to give it. That is useful to understand while you can still reconsider the hire or the way the service is delivered.
Bring both roles into the hiring decision
Before moving ahead, read the proposed employee role and your own management responsibilities together. Can you explain what the person would be able to decide independently, what would need your involvement and how you would provide it? If the arrangement still depends on you finding spare moments, identify what must change before relying on it.
This gives you a more specific decision to work through than whether you need help. You are considering a particular job for another person and a particular management role for yourself. The business needs both to be workable.
In business coaching, we can examine which responsibilities you want to take on and what that choice asks of you. Bring a real assignment and your description of the two roles. The first conversation stands on its own; you decide afterwards whether to continue.