How can I get physical custody of my severely autistic daughter ?

You can file a complaint of custody at your local circuit court.

MMy ex is refusing to let me see my daughter. I've filed 3 contemt of court cases against her.

Maybe you should have an attorney review your complaint and assist you with a path forward.

Where can I find a pro Bono lawyer in Southern Maryland?

I agree with counsel. You should prepare your case as soon as you can.

Should I be paying child support?

I do not feel comfortable saying you don't have to pay until seeing the documents. I would consult an attorney.

Can I be reimbursed for part-time (20 hours/week) pay when an employer extended less than 20 hours per week of work ?

Were you under the age of 16? Otherwise you should have been paid the minimum wage. https://www.dllr.state.md.us/labor/wages/wagehrfacts.shtml

How can i regain custody after signing over temporary custody to my parents?

You should file for custody with courts.

Do I have to prepare any document like pre trial brief before the trial?

I agree with counsel. I would add, you should gather your evidence and information before hand so that you are ready for trial. Additionally, if...

I got caught yesterday shoplifting .. will i be criminaly charged ??

One would not be able to assure you that the police will not file charges against you. It is up to the police.

Can I sue for payment for repairs?

Yes you can sue for payment of repairs. Whether or not you win depends on the strength of the evidence you have.

I agree with counsel. I also would point out that there are many more factors that will affect the outcome of custody case. The overarching issue...