Getting a feel for the housing market

Hello, I'm a new player looking to buy a house. The thing is I can't even see the prices of houses and I get an error trying to "buy" one of the abandoned ones in Astrub ("You don't have the required level."). Can someone please share some thoughts on this endeavour of mine, and also tell me what price they'd like for a house if they're selling one? I saw an ad for a sale on some huge house (and sum of money) from last year, but there may have been a lot happening since then.

Thank you for any answers!