Lego

I've recently gotten a lot of my childhood Lego from parents place to mine and am looking for a good way to sell them.

What I have is just a lot of smaller/medium sized sets from the 80s or 90s. I think most of them should be complete but I need to dig through bags and put them together, so it will take a bit of time to know.

With complete I mean having all parts, nothing broken or missing, including instructions. I only have a few original boxes left though, so its mostly bricks and instructions.

I am not in a hurry to sell, but I'd like to get back my storage space that this is occupying. One note is that I live in Northern Europe, shipping cost in my country is pretty high, especially for tracked packages, not sure this could be a factor to reduce my chances of selling stuff at decent price.

Any input/suggestions for this would be appreciated!