Heya there !
1) I'll probably use Unity.
2) Solo, but if someone is looking for someone work with or a team, just ask !
3) Of course ! Who isn't ? :P
4) Not that much, I only participed in the 2016 Global Game Jam so far.
5) Yeah, I'm not much of an artist (I can do stuff with MS Paint if needed haha !) and definitely not a music composer.
6) I have experience in C, C++, Javascript, Java, some notions of C#