steep some for 10 minutes at around 65c in a few litres of water and you'll add aroma. you can also drop them in a muslin bag after fermentation and leave for a week to dry hop, great way to add aroma. boil for an hour and you'll add bitterness, but it's difficult with small volumes.
use noble hops - hallertau, saaz, tettnanger, and it'll increase the hop presence in a lager. you can experiment with other hops too if you want :)