The range of income for the first year will be dependent on how many hours you want to work. Temporary placement positions range from $15-$25 an hour for entry level positions. Data Entry clerks, Website Designers, Software Engineers, and other more technical positions demand closer to $75 an hour.
You could also expand your endeavors to the point of locating clients and managing the people you place, then and negotiate 25-50% of their rate as your fee. This would give you unlimited income and eliminate the need for you to actually do the work yourself.
All companies need occasionally need to hire temporary outside help in order to cover employees who are out ill, out on vacation or on a long-term leave of absence. There are also retail positions that could be filler positions.
Your clients will consist of printers, website design firms, professional service providers and retail establishments. By providing temporary services you would allow them to hire you as the need arises.
Your marketing plan will be based on targeting either retail or professional service providers. Join a leads clubs in order to obtain personal introductions to firms that might be able to use your services. These personal introductions will provide you with much more rapid access to new clients.