I'm not ready to potty train - can you come and hold my hand?

[babybouncer]

Yesterday morning DS (aged 2 1/2) said he wanted to do a wee on the potty. Since then he's regularly sat on the potty (saying he wants to do a wee), but has yet to do anything in it. He's at nursery full time, but we've been taking his potty in and he's been sitting on it at nappy change time quite happily.

It's taken us completely by surprise - I'm due to have a C-section in about 6 weeks with DC2, so I was just going to leave this stage until sometime after the new arrival - and we have nothing practical except the potty, so he's still in nappies at the moment. This weekend we're going to go and buy some pants and another potty and have a stab at potty training.

I haven't read any books on this step - do you have any advice on:
How to do the 'now you wear big boy pants' speech?
How many pairs of pants do I need to buy realistically?
Is there anything else I need to buy?
How many accidents should I be expecting in the first few days?
I've got three days off next week, but what do I do about the 25 minute journey to nursery or visiting the library - do I just chance it or do you have any tips for coping with accidents when out?
Do you teach a boy just the same as a girl (ie sitting, wiping etc) or not?
Nappies at naptime or during swimming lessons?

As you can see, I'm desperately in need of any advice you can give!

Ha ha, I have resisted sharing other than with interested parties, however DH has been putting his spin on it on facebook!

Glad your DS is doing so well. Good progress here too, DS was at nusery yesterday for first time since we started and had no accidents (though one toilet overshoot meant he had to change his trousers!), though we had a poo-in-the-pants at home.

I'm getting a bit sick of saying 'do you want a wee wee or a poo poo?' though, like a stuck record! Trying to balance it so not going on and on and allowing him to realise himself and also minimising accidents.