Tiger will barely run on an imac g3 600 with 256meg of memory.
To surf the web, you need Tiger + Tenfourfox, which is a clone of the latest version of Firefox + you need a gig of memory. Surfing the web will be slow. WIth TenFourFox you can surf any site, but be patient. Videos are mostly a miss or slow with lots of beach ball visibility.
I have the exact machine. I had 768meg in the machine and TenFourFox was very slow. Boosting the memory to 1gig made a noticeable difference. I got another two years of usage out of the machine after maxing out the memory.
Get a cheap copy of word on ebay. Microsoft Office:mac 2004 works well on the g3. Microsoft has a docx to doc, etc. translators. The doc, etc. are still readable by the latest office versions. OpenOffice runs too slow & is frustrating to use.
You could leave the machine apart when loading Tiger. You need to boot just once when you install Tiger.
You will probably want to put in a new harddrive in the machine while you have it apart. Or, keep good backups.
You may still be able to buy a new Cannon Pixma mg3120. Has tiger drivers.
R