Me, and every other mum I know, have started with tommee tippee sippy cups - they are just great and quite cheap. Your LO might find it hard to get any water out of a non-spill cup so it might be worth saving that for a bit later on. It's only water so there's not so much of an issue with spilling really. You don't really need cutlery and plates really apart from the soft tommee tippee spoons.
what age is your lo? The tommee tippee first cup is the easiest cup to use as it is free-flowing. It is also cheap and widely available - you also get a lot of use out of it as you can use it without the lid as an open cup when you feel your lo is ready.
Re: cutlery - is it for you to use or for your lo? I started with the soft weaning spoons and then when my lo's were wanting to use cutlery for themselves I bought child sized metal cutlery with plastic handles as the plastic forks and spoons are rubbish. You can get them from Boots, mothercare, supermarkets, etc