sheldonbrown.com parktool ect for some free help on the net.
To open up the hubs you need a tool called a cone wrench (usually comes in 4 sizes). You might buy one of those home mechanic tool sets. Different for front and back. BB is a more complicated problem, I suggest you consider a new sealed BB.
2000 Montague CX, I do not recommend it, but still ride it.
Strida 3, I recommend it for rides < 10mi wo steep hills.
2006 Rowbike 720 Sport, I recommend it as an exercise bike.
1996 Birdy, Recommend.
Wieleder CARiBIKE (folding), decent frame.