Sure, a lot of foreigners find it an honor when they meet someone who is learning their language, and they become impressed if (say) they find your German to be better than their English. Note: not every German knows English, and even more don't know it well, so if you want a better chance on making a German friend, it's best you'd know the German language to a decent level.
Now I don't know much about the German language, but I'm pretty sure with every language, you would have to know its alphabet at least sometime in the beginning. This is to recognize the extent of that language's pronunciations. You wouldn't want to see a "ch" and pronounce it "ch" every time when really its pronounced "sh" or "cuh".
Also, I suggest not learning through a book unless you reeeally want to become a German expert. For casualness, I suggest learning how little kids learn, like through learning-based songs, learning-based games, shows for toddlers, and watching a movie in German (you can probably start off with subtitles, but try to gear away from it asap so you're not so focused on converting the German to English rather than studying the German itself).
You could also try Duolingo! It's a free! This is just a website that provides interesting ways to challenge and test yourself in the language that you're learning.
There's also MyLanguageExchange! With this website, you can find a penpal that's German wanting to learn English. The two of you can exchange e-mails and from there do Zoom, Skype, or meet in person even. If you're lucky, you don't have to pay for this site. Someone else who has already paid can message you first (which isn't uncommon). Otherwise, you would have to pay to message them first.