I got a letter with penal code 490 and penal code 459

Who was the letter from? If from law enforcement it probably has a court date which you must not ignore, if from a law firm or collections agency,...

Will I go to jail or face charges if I am 18 and got my 16 year old girl friend pregnant?

If the authorities get involved yes you can be prosecuted. Any sexual behavior with a minor Is ilegal.

How can I get someone in jail to leave me alone when they get out?

If you have a restraining order against someone, and he violates it, call the police

ALLEGED SPEEDING

Any machine usage is subject to human error. For example if the device picked up the wrong vehicle speeding. Question is will judge believe it. ...

May be falsely charged with sexual assault, how do I proceed?

I will first address your second question. Yes hire an attorney. Everything you say to him/her is confidential and protected. He/she will be able...

How should I handle a hit and run? I received a 20002 (a) misdemeanor last evening.

You should remain silent and when you go to court, ask for a public defender.

You are free to talk or not talk to anyone, including detectives. Just depends on your end goal.

What should be expected next? Don’t need 100% accurate answers just opinions.

If you are genuinely trying to help your friend, talk to his/her attorney. The worst case scenario will involve him/her going to prison. Whether...

How long would I do for a 30.000 warrant?

Imposible to say without knowing all the details. Get an attorney

Can I fly if I have a bench warrant for trespassing?

You can fly but you may get arrested.