Thanks for the reply.
Do I have to set up Masquerading in order to internet share though?
I've found this How To for Masquerading
or IP MASQ, but it's a lot to read and learn simply to set up an Internet sharing network. I am not too worried about security, and I don't think I would need my laptop to access the Internet invisibly, as the text seems to suggest this does.
Also, just wondering where I would save that file, and what I would save it as, or if it matters.
Edit: OK, I managed to get it working. Not sure if this is the best way, but it works for now.
What I did was reworked through InternetConnectionSharing
and whereas this was a tutorial for sharing Internet connection eth1 through eth0, I simply replaced eth0 with wlan1 (my wireless network adapter) in:
sudo iptables -A FORWARD -i eth0 -o eth1 -s 192.168.0.0/24 -m conntrack --ctstate NEW -j ACCEPT
sudo iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
sudo iptables -A POSTROUTING -t nat -j MASQUERADE
sudo ifconfig eth0 192.168.0.100
Simply by changing those two lines, and setting the Method in IPv4 settings to "Shared to other computers" for the wireless connection I set up on my desktop, I am able to share my Internet connection wirelessly at home.