For the making the business plan here are the few common things that you have to derive, specify or have to collect information about it !
what will be the 'Mission Statement' for your business?
Choose Team with required skills
Do study about market and collect Market Summary.
Identify the Opportunities in the current market situation
Wright down your Business Concept as well as Marketing strategies
Gather information about your Competition, that can be find by services or product providing companies from earlier that your willing do.
Decide Goals & Objectives, which will clears your path for achieving.
Important thing is making the Financial Plan, without financial planning you would be helpless.
Know about your Resource Requirements for running successful business.
Identify Risks & Rewards which will ensure your business life for strongly survival..!
Hope so it will be beneficial for you.
All the best.