Kitten proofing...hahahaha!
Our kittens turn 1 on Friday...this is my experience:
Get the biggest, most elaborate cat tree you can afford/have room for and plenty of toys - they don't have to expensive, if they roll, dangle or make noise it's all good.
Don't forget to take out insurance immediately. Even tiny kittens can go wrong...a £300 bill for an enema due to a tiny bowel being blocked a few weeks in is not something you'll forget in hurry!
If you have open shelves anywhere make sure you remove anything breakable from them like funky teapots and expensive cafetieres, for example
Bear in mind windows...being able to open them if they have to be indoors until vaccinated/neutered, and curtains, net curtains, blinds etc...all make great climbing opportunities.
As PP said...some kind of wire protector, don't forget chargers that might not be out all the time don't leave headphones or ear buds lying around either
Be aware of them being able to reach anything wall mounted that they could potentially climb/jump on
Remember you'll probably never be able to have fresh flowers in the house again
Invest in a bloody good hoover and a lifetime's supply of lint roller refills
I have been really lucky wrt them attacking the furniture and using their litter trays...bought them home at 8 weeks, put them each in their trays and scraped their paws in the litter and they have never had an accident since.
Remember that in spite of all the above you will be their slave for the next 15-20 years...and you will love every second of it 