UFB install completed - Advice on Switches and an additional AP

Hi all

Modem NF18ACV

Our fibre install is now all done, so i have a few questions

We have a few old switches in various rooms 10/100 mbps I think

Should i be updating these, I have a feeling these will possibly be a bottleneck, but then again i'm not sure if i have confused my bits, bytes and nibbles

and if I am updating just a small cheapy switch should be fine?

Also AP, newer devices work perfectly at the far end of the house but some of the old ones are a bit hopeless leading to a grumpy daughter, i do have an old airport extreme (2nd Gen) which could possibly do the job, or should i look at some time in the future getting an extender for that end of the house, I do have ethernet down there.

Thanks in advance