and I have no idea on how to buy a house ...
How much does a house in Riften cost and how do you get a house there? I've tried gettign one in whiterun but i cant for teh life of me find a seller ...
Where available, a house must be bought from the Jarl's steward. In Whiterun this becomes available during the main quest, in the other locations this becomes available after talking to the Jarl and doing a quest for them. (If you do the Civil War and replace a ruler that's also sufficient.) Honeyside, the house available in Riften, is 8,000 gold, and that's without any of the upgrades.
The steward is generally standing next to their respective Jarl. In Whiterun it's Avenicci, in Riften it's the elf that usually sits next to the Jarl.