One of the bands - Elastica - wanted to shoot a music video and needed 100 fans to be in London in 2 weeks time... the band asked me if I could send a letter, I had 2,000 names and addresses and I got a few friends to volunteer and we hand-wrote 2k envelopes in 5 days and posted them with a phone number to call if you wanted to be in the video... then we went to the management company and manned the phone. They got their 100 fans and had a waiting list of another 200.
The band management company asked how we did this and whether they could put us on a retainer to do it in future as they had big plans for another band - Blur - and I pointed out that it was infeasible to write so many envelopes so often. But I believed a computer could do this, so if they bought me a computer and covered postage and packing, I would build a way to keep in touch with the fans of their acts.
They bought me an IBM 30386 and I had it in the upstairs of the squat. There was a hole in the roof so this part of the room was covered in tarp, and we stole the power from another loft as the hole in the roof granted crawlway access to other lofts. I had never used a computer before as I came from poverty, but I got a book from a library, a reference book on basic, and used that to programme a simple database based on text files, with index text files that I could then mail merge into envelope labels. Scaled that slowly up to be a full database (single user of course), and then a stock control system as staying in touch with fans meant we expanded into selling T-shirts mail order - which produced a surprising amount of revenue.
That was the start... and by then it was 1994 and a lot of the bands that were nothing were about to be something.