Yes you need wetting agent, unless you like spots on your negs.
Spend money on a good thermometer - when I bought an enlarger in the 90's and was working in a darkroom/storage closet, I used a cheap thermometer meant for fishtanks. Took me awhile to figure out that my very thin negs were due to underdevelopment because the thermometer was off.
A watch/clock/iphone can be used for a timer, if you're looking to save a couple of $$ right now. (I love my Gralabs - picked up an unused 2nd hand one for $10 last summer.)