I saw an Acorn BBC micro on the BBC TV programme (broadcast on U.K. television). Then at secondary school there were three computers, two of which were beeb's (both model B's I think, they both had 5.25" 40 track floppy drives, running what I now know is DFS).
I took computer studies and used the beeb's for my project.
At home, I shared a 48k ZX Spectrum with my sister. This was the first computer that we had.
Despite really liking the BBC B, I never did get one, so I upgraded the Spectrum with a proper keyboard (from DK Electronics). Then the Atari ST came to the UK. I saved up and got a 520 STFM (with a single sided FDD). I also got a multisync colour monitor so that I could use all three video modes
I have no idea what my first program was, as it would have been something simple at school.
Or may be something simple that I typed into the machines on display in the shops like:
10 PRINT "Mark woz ere"
20 GOTO 10
That kind of thing. Later on I learnt some tricks, so use to annoy the shop staff by typing in a handful of lines of code that meant they had to switch the machines off to get rid of it (at least on the Electon and BBC Micros, and the ZX Spectrum)
I wrote BASIC programs both at school on the BBC Micro and at home on our ZX Spectrum. Did try writing some games, but found BASIC a bit too slow. So mainly wrote utility, information display (using the BBC's Teletext mode) and programs to perform calculations. Later I added hardware expansions to the Spectrum, so I wrote code to control these.
On the Atari STFM I bought and used GFA BASIC
I forget the first computer magazine I got. I tried most of the Sinclair / Spectrum magazines including Crash.
Our paperboy loved that I had Personal Computing Weekly delivered (he use to read it before delivering it).
When I got the STFM, ST Format was my favourite. Got that until it closed.
The first game that I played would have been on the ZX Spectrum. But I have no idea which one it was, as my dad bought it from Rumbelows and the deal included ten games. But I do remember our favourite at the time, and that was Lunar Jetman Mark