Some folks will also go vegetarian for the first 3 days.
In HK it's very popular to get daffodils (narcissus) bulbs and get them going so they bloom on New Years Day (or close to it).
Decorating w/ red gladioli is also popular.
Some people will buy miniature orange trees (the oranges look like gold).
Other people buy a flowering plum tree, but I've also heard that you have to be careful because once you buy one for luck you always will have to buy one. So we don't get one.
Once I visited someone at CNY and they had me walk around their flowering plum tree. I was told if you're unmarried and walk it 3 times, you'll marry that year. It worked for me.
We take a special bath the night before.
Some people don't bathe for the 1st 3 days (wash away the luck). Others will not sweep or vacuum for the 1st three days (wipe away the luck). Definitely don't cut your hair (people usually get fresh hair cuts before).
We eat a lot of loh-ba-goh (savory turnip cake/pudding). It's easy to fry up and also quite a "lazy" meal for the holidays. Also it can be "cut" w/ a spatula or a spoon, so no need for a knife (not good for the New Year).
In HK when you pay calls during CNY, you usually bring some sweets wrapped in red paper, cans of Danish butter cookies are very popular, as is chocolate.
Of course there should be no swearing (esp. swears that say "sei"- death) or arguing or fighting for the 1st three days.
My m-i-l says you shouldn't buy shoes for the first month, bad luck - but I don't know why.
We also have a special sweets box w/ eight compartments that we fill up with things like dried melon seeds, sweet dried coconut, sweet dried louts root, chocolates, etc.
Now I should get to work on my list of cleaning.