Flying on Saturday few Q

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I'll be flying to Mongolia this saturday via Air China and then MIAT.

This is the first time I'm taking camera stuff with me as hand luggage on board. So I hope you guys can help me, ease me little.

1. I was gonna buy Lowepro Mini Trekker but ended up with Lowepro Nova 5. Will this be allowed, in terms of size. (also I will be taking iBook G4 in another bag).

2. Will I be able to carry the spare battery and charger, lens cleaning solution etc all in the same bag? (don't want this blowing in my bag)

3. Do they usually check bags after x-ray or metal detector, if so is taking all the camera equipment apart from tripod is allowed?

4. I havn't used the air transport service for the last 10 years, so feeling bit nervous and what should I know and be aware of in general.

thanks in advance

 

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do you guys usually take laptops onboard or leave in the luggage?
How safe is it?
I might have to put some of the lens in the main luggage and just take the camera with 28-75mm lens and laptop inside the nova 5 bag.

Last thing I need is not being able to take everything I want.

 

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Whats the max weight for hand luggage? (usually)