"Plans are useless; planning is indispensable," according to Dwight D. Eisenhower, then Commander of the Allied Forces in Europe during WWII. Now, you may be in total agreement with the first part of that statement, but you are really not convinced of the truth of the second part.
While these are easily available online, some of them are way better than the others. A lot depends on the approach that goes into writing the business plan.
But your idea may be so new that you may also need to talk to potential customers, host some focus groups, talk to an ad agency, or maybe even make a prototype and float it past some people. Be prepared to spend the time. Remember, it's not about the Plan but the Planning.
Website design templates also offer you a wide array of features so that you get only quality results. It is a much cheaper way to promote your business. It cuts down your major expenses. Even a person who has least knowledge of the technical things can easily customize these templates.