Hey and welcome to the forum 
The current situation is that we don’t have a date for the launch of testnet3 (which is also apparent if you look at some of the other threads asking the same question) but evidence is piling up that it is just around the corner. So we’re all patiently waiting and chewing on our nails in the meantime.
Regarding testnet2, I suggest you wait until testnet3 is up because there isn’t much you can do at this point.
You should use the time instead and read the SystemDocs that are available on gitbook to become more familiar with the whole concept (just in case you haven’t done that already).