This assumes that you have already identified who your customers are going to be and if you haven't then you should. Yes of course you can. The more help and advice you get before you start the better. This help is sometimes free. Grants are available in some areas.
Different grants are available for different sections of the community and for different proposals.
It could be argued that if your business idea is dependant on a small grant of around 500 then potentially you don't have much prospect as a business. Nevertheless grants are useful as an addition to your business finances. There are good things and bad things about grants. Clearly the good things revolve around money and advice. The bad things revolve around how much effort you have to put in to get that grant.