Staying away from sin

Q: I had heard an incident of the past wherin 3 people where closed in a cave and they each looked at a sinful act of their past to which they abstained and then asked Allah to move the rock blocking the entrance and Allah accepted.

This made me think and some weeks later in a depressed state whilst making dua to Allah, I said such, Oh Allah I will try my best no promises to abstain from this sin, please let me be married now. If I lapse into this sin again will I be accountable now for 2 sins.

1. The sin itself

2. Not abstaining. wrong

I am still not married. Please assist me. I am concerned that I unknowingly might have committed a vow and now I don't know what to do.

Divorce and custody of child if husband is in jail

Q: I need guidance in this situation:

My husband is in jail for murder, and has not been incarcerated yet. It has been one year now and this is a cause of stress and pain to me. We have a child and I am getting no financial support from him nor his family. My child does not know that her father is in jail. I kept my child away from seeing him because I know how hurt my child would be. Due to this matter, am I able to get a divorce?

He is asking me to see his child, does he still have the right to see his child if he is in jail? If a divorce takes place, do I still have to bring my child to see him?

Masturbating while fasting

Q: I am a Muslim boy of 15 years old. Last year in Ramadan while fasting I masturbated but stopped the ejaculation but it leaked. Secondly same Ramadan I did the same except semen did not come out. Please help me and tell me what is the ruling on both of these cases. Please note that I am 15 and do not have that much liability. 

How to calculate zakaat

Q: I'd like to know how to calculate zakaat. I am 25 years old and have never paid it as I don't know how to calculate it. I do tutoring for 2 children, I have some shares, I have some money in my bank account and I have money in a money box but I don't know how much money I have in that money box. I also have some gold jewellery of which I wear some of it but not all and I don't know the value of it.

Is it true that you have to also pay zakat on clothing that you have not used in over a year? Please assist.