VPN over DSL

HI,

I am having small network with 5 computers and one windows 2003 server, connected to internet through DLink DI-524 router. my server has one NIC. Can I make my server as VPN server to allow outside clients connect to my network?

What I made till now is

1. Installed RRAS on my server.
2. Opened ports IPSEC – UDP 500/500 &
PPTP – TCP 1723/1723 on my router to servers private IP.

Am i need to do any additional configurations either on router or/and server?

I hope I will get help from you guys

Thank You
Sridhar.