child-names.com is fairly ok domain in my opinion, it has 2,400 exact monthly searches and it is a clear short domain name, even the dash suits it.
You can either develop it or sell (or develop and sell), it should bring you some money either way. Also developing it should be very easy, because it does not require any specialist knowledge. The other domains are a little bit 'iffy' though.
In terms of learning I found really useful scanning the auction sites, and the online resources which publish already completed sales.
When you scan auctions and marketplaces (search this forum for the most common auction sites urls), first thing you should do is arrange the domain list (and you will be shocked at how big it is) according to the number of bids and/or the number of offers which domains receive. This gives you an immediate picture of what kinds of names people are interested in. Obviously the same with the completed sales records, you can see what has been actually bought and for how much.
Then on the basis of what you've learned (and you need to read and re-read and re-read these domain lists in order to get a good grasp of which names tend to be valuable/wanted) it will be much easier to make decisions when buying or registering your own domains.
By all means use the forum and ask advice, but nothing is better than the raw data of domains which are out there, and which are selling and getting offers. It is more difficult way to learn I suppose, but in my opinion much more reliable - and something you will end up doing anyway if you engage in this business seriously.