As you know, building up credit is a process. Along with repairing your credit, you'll need a credit card to reflect creditworthiness. Starting with a secured credit card is a fantastic idea! Banks usually require an initial deposit of $200-$500 deposit. 

This deposit will be available for your usage within days of applying for the card. Be mindful not to exceed the 30% utilization of your credit limit.

Example: Credit Limit is $300.

30% utilization is $90. Don't exceed $90

I strongly suggest that you use this card to make small purchases such as gas or groceries and pay the balance in full each month. This will show your creditor that you are responsible and creditworthy. In a few short months, your secured card will convert to an unsecured card.