It would be best to get your own business account with your name as a DBA so you can deposit clients checks. That way your expenses are written out as a business expenses.

As for putting funds into your business you can do that. Most businesses owners fund their own business until they have cash from clients. I've done that before when I had to pay for a business expensive but didn't want to use my personal cards.

It is best to keep everything separate. Mixing business and personal assets can become a mess. If you ever got sued someone could pierce the corporate veil that way too.