To be influenced by a magazine and, say, a Swedish theme, unless it resonates with you, it seems kind of odd and influenced.
Be judicious with your budget and buy things that are going to last.
Avoid spending too much on one thing.
People buy things in isolation and don't think of how they work together.
Think of how much furniture you need. What's the best way to have it be functional in a great way? If it's in groups, define it.
To have a 9-foot sofa in a small room can be kind of treacherous.