I got into the darkroom via an evening course at my local college and then quickly progressed to acquiring my own setup secondhand from a classified ad in the local paper.
It's a route that worked well for me, allowing to me to try out darkroom work in a supervised environment without incurring a lot of expense. The secondhand setup I got was cheap too, but did everything I needed it to.
One thing I'd advise is to accumulate gear
s l o w l y... and to look for alternative, non-photographic items that do the same job but cheaper - e.g. instead of an expensive photographic process timer, a sports stopwatch has the same functionality at less than half the price. Kitchen measuring jugs cost pence and are just as accurate as measuring cylinders costing pounds, etc.
(Note to mods - There used to be an old thread entitled (I think) Great Photographic Rip-Offs Of Our Time with tons of tips like the above, but my searches aren't turning it up... Has it been killed?)
This allows you to save money and spend it on things that matter - A sturdy, stable enlarger and a good quality lens to put in it. A few good books like Tim Rudman's "The Photographers Master Printing Course" are also well worth the investment.
The chemicals used for B&W are
mostly fairly benign, as long as you don't go bobbing for apples in them, etc!
Whatever route you choose, remember to have fun with it!
All the best,