Hi Manueli
Firstly milk is still the most important part of your LO's diet, at this stage any solids you give are to complement your milk and eventually replace it. We started giving DD solids once or twice a day and in between meals so she wasn't starving or just fed! Eventually (only after a few weeks) she started crying in between meals and we soon figured out she actually wanted solids!
The theory with BLW is 'they eat when they are ready' so when you 'offer' foods he may choose if and when he feels like eating it. Plus he will eat as much as he wants or is able to. With puree feeding they don't get a choice, mum and dad are normally spooning food into baby's mouth whether they want it or not! The feeding one new food a day is allergy based, we are paranoid that our babies will be allergic to everything! There is a book by Gill Rapley:
http://www.amazon.co.uk/Baby-led-Weaning-Helping-Your-Baby/dp/0091923808/ref=sr_1_1?ie=UTF8&s=books&qid=1262902640&sr=8-1that covers this quite she well. She says that some babies actually avoid food they later discover they are allergic to! The other theory with BLW is that a baby's digestive system takes months to adapt to new foods so by puree'ing it their little bodies don't have a choice but to digest it and allergic reactions can happen more frequently. With DD we frequently had a nappy full of fresh food! We would see whole chunks of tomato, avocado skin (she accidentally swallowed) and all sorts. She's 16months old now and only obvious foods show up like peas, sweetcorn (naturally) and kidney beans!
You can still do purees with BLW, it's just purists like me (DD has never had a single spoonful of puree) that can't be bothered with it all! Admittedly we do spoon feed her when we don't have time and want to avoid mess so some stuff like yogurt we feed her, until she gets bored with that and takes it off the spoon with her hand before eating it!
I'd say at 6 months he's too young to hold the spoon and that will develop with time. As for playing with food, all babies learn through play! Every part of their development should be fun and playing with food is probably the most important part of that. DD NEVER played with food in the early days, she was just intent of shovelling it in her mouth! Now she's older and 'developing a mind of her own' play time has started! She uses peas as 'tiddly winks' squashing them or making them ping across her tray! She crushes everything to see what happens and loves to try and use her Doidy cup as a hand wash! We went through one stage where she wanted to put all her food in her water, let it soak and then eat it!
We NEVER encourage behaviour we don't see fit and we find most things are 'phases'! Some things are really annoying and you just have to bite your tongue, other things are incredibly funny and we have to walk away or turn around so she doesn't see us laughing in case she thinks what she did was good! We are currently in the full 'lets throw food on the floor when we're angry' mode! This is not a fun time!!!!
It's true some babies take months to get the idea of food! It depends how fast you want him to wean! We have been dropping milk feeds one at a time. In fact we have just dropped the morning bottle which was only 5oz and she really couldn't be bothered with it, she seemed more interested in eating what we were eating afterwards. It's not been a week yet and so far it's going well!
I found the hardest thing with BLW (apart from the mess) is our parents! They CANNOT accept this 'new way' of weaning and are constantly putting doubt in your mind. My father in law actually said (months after we'd started) that they thought what we were doing was rubbish, it would never work and we'd soon be whizzing away with the purees! We proved him wrong!
Let him lead the way. Never give up with a food he seemingly doesn't like, one day he'll eat nothing but bananas (we had to hide ours for quite sometime!) other days banana's will be repulsive to him!
HTH?
xxx