If you see yourself monetizing your blog at some point then it may be worth to run a bilingual blog by spending some money into hiring a freelance translator or spending time doing it yourself.
I personally can't think of any blog that is fully bilingual. I suggest you try blogging on just one language first and then translate some of your more popular posts (kinda like RoK did on their girls w/ tattoos article).
Overall I think you've got nothing to lose by experimenting a bit. It sounds like you should first stick to German, specially since you mention that other bloggers could support you on your project. You are also lucky in that many Germans speak decent English, so if eventually you want to stick to English only you probably wouldn't lose part of your audience.
I personally can't think of any blog that is fully bilingual. I suggest you try blogging on just one language first and then translate some of your more popular posts (kinda like RoK did on their girls w/ tattoos article).
Overall I think you've got nothing to lose by experimenting a bit. It sounds like you should first stick to German, specially since you mention that other bloggers could support you on your project. You are also lucky in that many Germans speak decent English, so if eventually you want to stick to English only you probably wouldn't lose part of your audience.
Тот, кто не рискует, тот не пьет шампанского