File Achillea,
A scandoubler/flickerfixer would be the best solution, but they are hard to find and expensive.
Alternatively you can use the A520 TV modulator and connect your Amiga 500 to a TFT-TV or a PC with a TV card (RF or preferably composite). The A520 solution will mean some loss in quality but it is acceptable for most games. You could also get a RGB-Scart cable from AmigaKit for even better picture (no A520 needed in this case).
A number of PAL-->VGA solutions found in ebay should also work with the A520, though your mileage may vary. The subject has been debated to death (search the forums).
If you want to do anything other than games (e.g. draw in DPaint, prolonged workbench usage) then a scandoubler will make your life easier.
Any more questions, keep asking here - there are many, many people around that are far more knowledgeable than I, and are always eager to help. Welcome and feel free to also try
www.amigahellas.gr 