Temperature control is a must for lager brewing. Lager ferment temps are 45-55 F depending on strain and style. Acceptable lager storage temps are 31-40 F. If you store it on the cold side, it will take longer to mature, like up to 3 months, but will have better flavor. If you store it on the warm side it will not be as "smooth", but will peak in flavor faster, as soon as 2-3 weeks.
Storing any beer over-long is not great, unless you're looking for the raisin-like, vanilla-like and honey-like flavors that come with aging stronger beers for months. As above, the stronger the beer, the longer it will take to mature.
Leave some yeast in your lagering beer. That's critical. Only rack it if there is excessive sediment from trub or dry-hopping. If you're storing it cold, you have very little risk of developing off flavors from dead yeast.