Thanks for your advice. So, I guess the very first thing I need to do is to purchase is router - followed by a high(er) speed modem (which I think can be considered at later stage).
From a simple search in the Sales Garage, I found these:
3G Wireless Router
TL‐MA180 (Coming Soon) 3.75G HSUPA USB Adapter RM105
TL‐MR3040 (New) Portable Battery Powered 3G/3.75G Wireless‐N 150Mbps Router RM110
TL‐MR3020 (New) Portable 3G/3.75G Wireless‐N 150Mbps Router RM89
TL‐MR3220 3G Wireless‐N (150Mbps) Router 4 UTP RM88
TL‐MR3420 3G Wireless‐N (300Mbps) Router 4 UTP RM99
Source / Credit:
http://forum.lowyat.net/topic/1015038Is TPlink MR3420 a 3G Modem Router whereby no Modem is needed? If yes, then at RM99, it's a good deal.
Otherwise, I would consider MR3020 or MR3040.
More sharing on this is welcomed

3420 is not a modem. is a router...so u still need a 3g modem.