Storage, freighters and online play.

I need help storing more materials so when my friend gets the game we have plenty of items to share and build with. My Freighter is full and Im not sure what else to do. I also want to know how to online play for Xbox works. Is it like an MMO or like a Minecraft server? I just don’t seem to understand, Sorry if there was already a post on this. And finally, where do I get my hands on a bad ass freighter? I have a cool A Class, but I want a massive one. A capital Freighter is what I have heard them called I think, any advice?