Second question is whether security deposit should also be charged on credit card or is it better to request a check?

Are there any grants (city / state / federal) that I may be able to apply for as a first time home owner?

Should I take the security deposit from them or closer to the moving date?

Focus your efforts on what ever is necessary for you to find a job that will be more secure.

Definitely consult with your CPA about this as you may have specific situations that didn't come up in your post.Generally, there is an advantage to running businesses like property management or wholesaling through an LLC taxed as an S-Corp, as it can save you social security taxes (your CPA can run the numbers for you along with a more comprehensive tax plan).However, it's usually a bad idea to hold rental property in an S-Corp, so you probably wouldn't want these two revenue streams (rental and wholesaling) running through the same entity.Let me know if you have any questions!

But what if a bank could give me a secured loan up to the amount of my documented contributions, while also holding that same money as collateral?

We have 1st, last, and security deposit. 

Granted, because of this, there are a lot of "miners" here so you'll have to be creative and consistent.    

@Grant Hibbert Hey Grant, thanks!

I am concerned that because of my age and lack of money I will not be taken seriously by banks when trying to secure a mortgage.