New Pipe Smoker With A Question? Ask an Old Fart

1. What humidity should I store my pipe tobacco in?

2. Is the tobacco okay with various blends in their own individual plastic baggies yet intermingled with other blends in their own plastic baggies? For example I've 3 small bags of tobacco, each a different blend, in the same humidor.

3. Lastly, is there any issue keeping a tin of tobacco in my humidor with my other non-tinned tobacco?

Thanks in advance!