Shipping overseas

Maybe no one can help me but I’m going to try.
I can sell one of my octo’s in my profile pic via my Instagram but I would have to ship it from Belgium to the UK. I will listen in my post office after the weekend but was curious if anyone here would know anything about it aswel?
And also, how do I ship it? In a box, clothing bag… I’ve never send any of my work, I’ve just sold them on local markets.
Thanks in advance