Ok for networking try the following:
Qemu works AFAIK only with virtual Lan Cards have a look at http://fabrice.bellard.free.fr/qemu/qemu-doc.html#SEC20
to see how it works.
To use networking with my win2000 in qemu I have done the following steps:
1) create a file /etc/qemu-ifup
sudo -p "Password for $0:" /sbin/ifconfig $1 172.19.1.1
2) enable paket forwarding on your host system:
echo 1 > /proc/sys/net/ipv4/ip_forward
3) create a NAT rule on your host system
iptables -t NAT -A POSTROUTING -o eth0 -j MASQUERADE
(replace eth0 by your outgoing interface on host system if its not eth0)
4) start your windows: e.g.
qemu -hda win2000 -net nic -net tap
5) configure windows network:
your ip 172.19.1.2
Snapshots: I haven't tried this feature yet, maybe you should have a look at the documentation of qemu.