You said it: one film, one developer AND KEEP IT SIMPLE. Just get a quality film (you are in England so Ilford, maybe HP5), then get any developer, but get something one shot: Ilford has some (or Rodinal).
NOW we get to the important stuff: find the speed you like for your film (usually slower than the box speed for me, but who knows what you will like), then find a time for your development AND an agitation scheme (both important). Be consistent with your time, temp and agitation, and you will get finally good negatives. In the end you will have to scan your negatives, don't let someone else do it. Send your scanned file to a good lab and evaluate. After a year you will say, 'hey I'm getting it.' If you choose to do it a different way it will take you 8-10 years (I know).
Don't worry too much about metering, just use a film camera with an in-camera meter to start. If you are hand metering use the same meter the same way every time. Do not change more than one thing at a time.