Is this any good and where should I go from here? I would like to sell it and make some money off of it, but I am not sure what it is worth. I am really new to this so don't jump on me. Thank you for any help
Your best bet is to hope that twitter makes you an offer. I personally wouldn't touch it for trademark infringement reasons.
Twitter may go for kids.twitter.com rather than kidstwitter.com. I agree that owning such names may create trademark infringement issues.