The more detailed you can make your question, the more likely someone will speak up and answer it with some advice or opinion. General list etiquette rules do apply to this list. If you post a message that attacks another person in any way, you will be removed without warning. If a dispute breaks out on the list, you are expected to take that argument off-list. Failure to do so will result in the removal of all parties involved, without warning.
Signature files are OK, as long as they are five lines or less.
Large .sig files are inappropriate and do nothing but take up disk space and bandwidth. Also, it is important to trim your messages. If a thread gets too long, remove the beginning of the thread, or edit out the parts that don't apply to your response. If you don't understand how to trim email messages, you have no business being on this mailing list. HTML email is also a bad idea.