In regards to your specific questions, that is all relative to the sponsor. Some may reimburse you with a monetary amount, others will provide products or discounts for products that they produce.
To find a sponsor you need to 'sell yourself' much like applying for a job, you need to tell them why supporting YOU is beneficial for them. Simply putting one of their posters up is not good enough. They need to make money out of the deal by increased clientele.
Often if you are good enough and doing very well, sponsors will approach you rather than having to go chasing them.
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