|'98SE will be fine; but remember you will need applications too? Although I think '98SE does include a basic word processor - aka "word" - ?|
You will also need an antiv-virus utility... and there at least two freebies "out there". AVG and Avast. I favour Avast - avast.com.
You do have register to use the freebie/home-use version; but then it's yours for at least a year or so; after-which you usually re-register.
Don't be put off by the "lots of posts all over the place noise... Everyone starts somewhere and gets to know how a given forum operates... Come back if you need more help...; but perhaps post in the '98 forum if using '98... And maybe include a reference to your original post here so pholks will remember/recognise you and so on...?
This is one of the best forums around; and I have been across more than a few and occasionally still go to two others just for a look-see. There are some "very" knowledgeable minds here (and on other sites too to be fair).
'98SE full version is likely on eBay and at some clearance houses too, and didn't ought to cost but a few $$/££? If you have problems securing a copy (and ensure you get the CD Key for it) post back here - in this post - and see if pholks can help; or contact me here, as I do have a spare copy...
Incidentally you say you had questions about 3 PCs... No harm in posting separately for each; often means different pholks may/will get involved with each...? All 3 in one post can sometimes mean one or other may get lost, ignored, forgotten in the discussions...