In addition to a fully fleshed out business plan or business model, you will probably need to condense this information into a pitch deck or a pitch presentation. When you are seeking outside capital from venture capitalists or angel investors, they are going to want you to pitch your company to them opposed to sitting down and reading your business plan. In addition to securing outside capital, a pitch deck or a pitch presentation can also be used to approach other clients or customers if your business sells B2B (business-to-business), and these presentations can also be used to approach companies in complimentary lines of business for strategic partnerships.
Another great way to get ideas for your pitch deck or presentation is to look at the presentations that successful companies have presented to investors. Click the link that says "The slide deck we used to raise half a million dollars" below to see the slideshare presentation of Buffer's pitch deck from their first round of VC funding. On the right hand side of this page, there will also be links to pitch decks from other successful companies.