Hello Torbjørn,
Welcome to the forum.
Hopefully you will get all the help you need.
For starters, I suggest you look for your niche. You need to find something around you that you would like to market.
After which SaleHoo can then help you look for the suppliers for the product you have selected.
It's up to you to start with either wholesale or dropship.
Hope this helps. Let us know if you need further assistance.