Sponsors, you can get one from your team, and there's a lot of them. The first day you won't get that big of an offer, but after 1 day or two (If your team is succesful in team ranked & has a big reputation) you will get sponsor contracts for $20K each.
Upgrade your sponsor slots to get more sponsors at once, and you'll soon be making a lot of money.
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^^ 100% This, I like to open a slot a day but it really depends on the offers available.
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Sponsor slots do ramp up in price the more you have.
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Yeah i was afraid to keep ramping up my sponsor slots because i didnt want to spend such a huge chunk of cash on it, but once you get 3 or 4 sponsors you make that money back really quick.