You will need to develop a listener base first, and go after sponsors 12-18 months later at the earliest, assuming if you have a hit on your hands after this time.
They need to see longevity and quality. Podcast burnout is very common - most never see past the tenth weekly episode. The frequency often trails off too, and sponsors don't like that at all.
Be incredibly focused, come out regularly, and the sponsors will come to you. Not necessarily with buckets of cash, but they figure out the real players quickly and easily, and after doing this for a year you will know the answer to your questions. Good luck!