While you are setting up your company, look for foster or umbrella organizations, such as Fractured Atlas which will allow you to receive donations from your supporters under their 501c3 status until you are able to get your own.
Unfortunately, there are few, if any, seed grants available to young entrepreneurs looking to start their business. However, crowd sourcing is a wonderful way to build support from y our community, and bring in some funds. Because grant money is so limited and usually go toward companies with a history of community service, your best bet is individual and organizational donations. Do your research and look for for-profit companies that seek to engage the community within your local community. These will be your greatest resource for getting donations for your company. Get to know your community and who you seek to serve through your art as this will be the most important factor in building and eventually getting grant money. You have to put some foot to pavement, and just be persistent. You will get a lot of "no's", but that's just the process. This also gives them the opportunity to know you and to build the necessary relationships to building long term support for your company.
Start small and focus on incremental growth. Big dreams can often lead to big failure if you push for too much too soon. Be mutable in how your company grows. Having a stringent idea on what YOU want is one of the most limiting factors in building the organization. Remember, as artists, and nonprofits, we serve the community.
I hope this helps and I wish you the best of luck in your ventures.