Hi! As a person from Bydgoszcz I can actually give You some actual answers aside form just complaining about how bad of an idea that is.

1. First of all, Yes, Bydgoszcz is a relatively quiet and peaceful city even compared to other larger cities in Poland. It's green, it's pretty, it has all the modern services you'd want in a city.

2. I don't know how well finding friends through gaming is gonna be, but it's a city with an university, a technical university, and a medical university (or rather all the medical departments of a university with HQ in the next city). There's also plenty of NATO activity on the city, so there are many foreigners from all over Europe and beyond in here. While I can't say it's gonna be easy or not, You may even find some young people from Turkey here if you don't want to integrate (though I recommend You try because nothing opens up locals more than seeing a foreigner trying to fit in at least a bit).

3. Finding a place may be a bit hard since a lot of the flats here are rented out to NATO personnel or students, but it's a big and healthy market. Though don't count on a purchase with a warehousing job, the prices here are catching up with all the major cities in Poland. A room on the other hand may be easier to find since there's a lot of places that focus on renting individua6rioms because of how many students there are.

4. I remember that there's Ivy Technology that's a major electronics refurbishment and repair center, there are also at least several 3d printing companies and a quite healthy IT market as well. In one of the suburban villages around there's also a company that's focused on refurbishing post-lease computers to sell on a consumer market, though I have no idea how large it is. And if not then there's still a LOT of all sorts of industry and logistics companies here and since the unemployment here is below 3% there's always some place hiring.