Hi Kellie, congrats on being ready to branch out!
When you respond to RFPs you should always first and foremost send the information exactly as the potential client has asked for it. I know this seems really obvious but I cannot tell you how many RFP replies I have seen that are prepared by service providers who clearly do not read the client's request. And if they can't follow directions from an RFP then what kind of partnership could the client possibly hope for. If there's a request for a specific type or amount of information follow it to the letter. If they ask for a certain subject line, provide it. The little details requested in an RFP are often a test to weed out those who aren't really paying attention.
As to the job listings - again, good to check for any specific requests. It's also a nice touch if you can personalize the reply a bit. If there is info about the company you're replying to do a little research and let them know you took the time to be informed before replying by mentioning some specific thing about their industry, their business or their website (based on whatever you can see).
There is also a really good thread started on RFPs that might help as well -
check them out here