Sponsorship!

[Prok0]

If you approach someone about sponsorship I would suggest having a pretty concise proposal.

Who you are and your experience (keep it short and to the point)
What series you are running in (Formula D, Pro-Am series, etc)
What vehicle you are campaigning (provide some bullet points on modifications)
What you are looking for sponsorship wise (this is big if you dont say what support you are looking for it makes things much more difficult)

Also keep in mind 99% of manufacturers and companies will NOT want to give you cash to fund the program, at best while you are at the lower levels you will get put on 'racer' programs to receive discounts on products in return for running stickers/helping with promotion and advertising.

If you secure a sponsorship be polite and courteous, be active on social media in a positive way, and provide short poignant updates to the manufacturers/shops helping you out. If the shops/manufacturers like you, find you easy to deal with, and perceive you as adding value to their overall PR/Advertising campaign it will be much easier to continue working with them in the future.