Connect UK and Australia Offices - Best Practise

I am mainly a programmer but have over the years got into managing our companies network, so my knowledge is patchy. I have been asked to connect our 2 offices in the UK and Australia together so that the people in Australia have access to all things here in the UK and visa versa. At the moment they connect via VPN and then RDP to a PC here in the UK but they are starting to do a lot of things that needs to use our db's but local resources i.e. printing and scanning. So how can i achieve this? We run SBS 2003 here behind a smoothwall firewall. They have no server at present (just on a workgroup) but I need to get them one. Suggestions please.