Also join one of the German speaking groups in HK such as Krautlovers. Meeting up socially in a German speaking environment with ppl who are native speakers or ppl who have learned and/or lived in Germany. I'm a member, although I haven't actually found the time to join in yet due to travel and other activities that clash. It will also get your confidence and you can easily switch from English to German and vice versa. I understand what it's like as it takes me a day to blend my ear in when I go back to Berlin, and same when I come back to HK.
Plenty of Mags in German in Dymocks, such as Der Spiegel, Focus etc. Reading Die Welt, Tagesspiegel, BerlinerMorgenpost or even the tabloid Bild online will help with the business issues.