|You will not be able to use a USB-FDD to install any version of Windows 9x unless you track down and learn how to use DOS USB drivers.|
Windows 9x can do many things, and can be run on lots of hardware, but you have to have the patience and the perseverance to learn about its limitations and how to fix them or work around them. Once you get Windows 95 installed, then you can experiment with USB and other devices, but it will NOT support these things out of the box, much less during its DOS-mode installation phase.
If you do not have an internal floppy drive, then you will have to create a bootable copy of your Windows 95 CD, or you will have to partition, format, and copy the Setup files to your hard drive with another OS.
You need to make a list of the specs of the hardware in your computer, and then compare this list to known issues with Windows 95. As mentioned before, there are several obstacles in regard to processor speed, RAM, etc etc, but on a 2002 motherboard I will hazard a guess that all of these issues can be resolved fairly easily.
You may want to check out the forums at MSFN where there is still an active Windows 9x community and a wealth of collected information specific to Windows 9x.