Hello and welcome!
You can not purchase any bitassets (bit silver and bitgold) from bter yet. You will probably be able to do so in the future when other gateways start implementing bitassets. From bter you can only purchase bitusd and from btc38 bitcny i think.
You can get bitgold, bitsilver,bitoil,bitusd,bitbtc etc from bitshares client. The latest version of the wallet can be found here https://github.com/BitShares/bitshares/releases/tag/v0.4.27.2
The above wallet is for BTS the bank exchange. For Play and Music there will be seperate wallets but these haven't launched yet.
Music allocation is done.
For Play you can participate in their IPO for the remaining Play shares following this link https://playtalk.org/index.php?topic=21.0
Hope I was of assistance feel free to ask anything else.