Miss R,
Congrats , as you say it's not done and dusted yet. Fingers crossed.
On point 1, do up an inventory list of the things you wouldn't mind leaving behind, be specific in what you are bringing. My suspicion is that the buyers want the kitchen appliances and 'big' furniture so make sure you cover everything on that list, give it to your agent and be very very specific with them to ensure the buyers understand what they are getting. Make sure you cover the cost of the appliances as much as possible.
On point 2, make sure your solicitor knows whats been sold in the house, as the contract may need to specify 'contents' being sold also. they should advise as to you tax obligations as part of the convayancing transaction.