1. Determine the needs within the company: What do you want to accomplish in your company? What types of people do you need to hire in order to accomplish those goals? Do you have talented people who can multi-task and fill more role than one? (For a list of administration roles, see below).
2. How heavy is the work load? If you have a pretty heavy workload for the start up of your business, you will want to have as many administrative positions that you can afford. This way, each person will be able to stick to their specific jobs and assignment, to make sure that the work gets done. However, if you don't have quite so heavy a work load within your small business company, then you might be able to have some administrative positions multi-task for a while and perform various jobs.
3. Can you offer a competitive pay or benefits? In deciding what administrative positions will assume each different type of task, you also need to consider your finances. Will you be able to offer a competitive wage so that you can hire competent, qualified individuals? Will their salary match the work load and responsibilities for the administrative position? Although it sometimes is hard to offer a very competitive salary with a small business, particularly one that is just starting up, try to make your compensation and wages be as fair as possible. If you can't offer monetary compensation, you could offer other types of benefits instead (e.g. free company product, discounts, insurance, etc.). Competitive wages and benefits are usually large draws for qualified people to become interested in working for your business!
4. Typical administrative positions: A lot of people don't even know what types of administrative positions to have within their own company! Here are a couple of administrative positions which are helpful to have in a small business:

President : There needs to be someone who makes the final say on all decisions. Generally this position goes to whoever has started the business. This is a person who has a good understanding about the mission of the business, and has the vision and foresight to keep the business running.

Human Resources Specialist : As your small business grows and grows, you will want to hire an HR Specialist who can hire and train new employees. This person is qualified to discern who the best employees to train are, and they are well qualified to train them and introduce them to the company!

Employee Manager : The Employee Manager is a very important administrative position. This is the person who helps keep all of the employees on task and happy. He delegates responsibilities and works with the HR Specialist to help determine the abilities of potential employees. The Employee Manager also resolves conflicts within the department. Generally the Employee Manager is the person who is next-in-line underneath the President of the small business company.

Financial Manager : The Financial Manager is responsible for keeping track of all of the taxes, budgets, and finances within the company. In addition, the financial manager also helps to write and control the paychecks!

Marketing Manager: In order to get your small business publicized, you need a well-qualified Marketing Manager. The creativity of the Marketing Manager can really change the whole image and popularity of your business!

Operations Specialist : In addition to helping run the operations behind your business, an Operations Specialist is also very useful for small businesses because they can work with grant applications. Applying for government small business grants is a great way to help your business grow, and an Operations Specialist can research and write grant proposals!