Internet Connection Sharing on Windows 98 Second Edition What you need to know:
Internet Connection Sharing made its debut in Windows 98 SE; any earlier Windows will not support ICS. That includes Windows 95 and earlier version of Windows 98.
Instead of doing my own guide, I have to link this and give credit to the author (or whoever came up with this guide), because I do not have Windows 98 SE installed on any of my machine to be able to come up with my own setup guide. Therefore if you want to setup your Win98 SE machine to share your current Internet, than the below link will help you get started. Always give credit where it's due! Peace.
http://www.annoyances.org/exec/show/ics_98