The Experience of Introducing Solids: Any Advice?

So we officially started to give Daniel solids in Portugal. We started with oatmeal cereal and for the first few days, it seemed to go very well (he actually opened his mouth and ate a few teaspoons). Since coming back home, however, it hasn't been too fun... So far, we've given him a taste of carrot, sweet potato, butternut-squash, banana, pear, apple and he doesn't really like anything! :-( We've tried both home-made food as well as shop-bought. He just complains, looks away and even starts to gag! He even started to complain just by seeing the spoon and then when we tried to put on his bib! So we decided to have a few days break, let him just play with his spoon during the day, and yesterday, very casually gave him a small taste of pear and just let it be... (he still didn't like it but at least didn't complain as much). Maybe he's just not ready? It's true that even though he's 6 months, he hasn't really showed much interest in what we are eating like some children do. We're just going to take things really slowly and not force it on him... we figure he'll start eating eventually. I guess we just expected him to just love food and start to eat quickly... but it seems that it will just take time... If you have any encouraging advice to give us, we'd really appreciate it!