Hubby and I have credit scores well over 730. I just got a job.How long do I have to wait to apply for a loan?

We need a second car so he can look for a job. We have income from our internet business (draws in about $2k a month). I'm going to be drawing in about $1k at my job. We also have a co-signer with a credit score well over 800. How long must we wait to apply for a vehicle loan? When we last applied we couldn't get one because we didn't have "taxable income." We've now discovered that our internet business IS taxable income (we pay taxes on it, LOL!). So that, combined with my new job, and our awesome credit scores - do you think we'll qualify for a loan? If so when should I apply for the loan? I start my job Monday.