The best place to start is to contact your Netball Development Officer. They will know of local funding opportunities that might be open to you and will be able to offer advice on applications.
If you are an affiliated member you can also contact your County Netball Association to see if they have any support available.
London Sport also have a very good funding search tool which has a lot of different funding opportunities. If you enter your details into it, it will show what it has to offer. Follow this link here: London Sport Funding Finder Tool.