A person would have to first make an account before answering a question. Making an account takes only a few seconds, so volunteers can answer questions.<><><><>Everyone that...
No, not your time. But your travel expenses and normally any other costs you actually have may be. (You can't get a deduction for NOT making taxable income).
Definitely - It just depends on the firm. Most small firms with only one or two attorneys might not need any extra help, but it's always worth asking.
As a "volunteer" unless you have legal training...