It is an absolute must to have a pitch video. Videos are the best format to tell your story & drive campaign success.
Please keep the following points in mind.
Set a wide range of rewards, from low contributions (for people who want to be a part of the campaign) to large contributions (for people who are highly dedicated to your campaign).
Outline the key risks and challenges you foresee for your crowdfunding campaign as well as for the project or NGO you are looking to help. Qualify them by suggesting what you would/might do if the situation does arise. This reassures prospective Funders that you've thought through the execution, and have back-up plans in place.
So for example - if you are making a 3-floor building for your orphanage & see increase in raw material prices as a risk w.r.t cost inflation or unseasonal rains delaying completion of construction highlight that. Also tell the crowd that you will try and eliminate the issue by signing contracts that lock raw material pricing for 1 year and that you are making sure that you finish the foundation a good 1 month before the rains are too start so that work does not get delayed.