New to Mac a few questions

I recently became the lucky owner of a MacBook and I'm enjoying Leopard but I'm still getting the hang of installing and uninstalling applications, I have a few questions and I wsa hoping you could help me out.

I'm trying to install Darwine, to run a couple of programs like Packet Tracer 5 and a couple more, but I can't figure out how to run apps, is there a command or something?

I found another app called Fink, that lets me install Linux apps, but I couldn't figure it out too, I think I can run Wine with that but I would like to know how to I start using it.

I rather use something like Wine instead of using Windows on a Virtual Machine or Dual booting.

Thanks for your time.

Glenda