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@retrodicorsa
Probably repeating what's already been said (in different words) but:
Start by setting the high/lo limit screws - very important. Even easier if you can remove the chain... in the high gear (small sprocket) the spring tension is loading the screw so just fiddle with it until the jockey wheel is directly in line with the small cog. Then shift to lowest gear (large cog) and use your hand to put a bit of extra tension on the cable along the chainstay so it is tight up against the limit screw - again, tweak screw so jockey wheel lines up with cog, but be careful you don't allow mech to strike spokes. Now you can seriously check the indexing - on the small cog there should be no clicks left one way and the first click the other way should shift up a cog. If there's nothing wrong with the mech or the shifter you should have the full range available now, but obviously adjustment will be required to get the indexing right - concentrate mainly on middle of the block, the high and low gears are dealt with partly by the limit screws. Or bring it round and I'll take a look...