How much money a bike cost depends on the frame and the components on the bike, generally the liter a bike is being build , the more it gonna cost you.
I got a road bike (occasion) with carbon frame , mavic wheelset and ultegra components, around 8 kg , found this last year at ricardo.ch for around 1800 chf.
My MTB is also an occasion(found this at a bikeboard in vienna , austria ) for 960 euros, i changed a few parts i don't liked (cost around 500 chf), so a bargain(the frame alone was sold here in Switzerland for around 3000 chf).
For a starter i recommend for a roadbike the ultegra components from shimano, for a MTB the XT or LX Group from Shimano

At the bike shops you can pay for an hour of a worker around 60 chf........

Here is a list what size of the frame is recommended for your height(in german):
http://www.fahrradreparatur.net/fahr...rahmengroesse/