These are all to be agreed upon between the Landlord and the Tenant. There is no fixed rule regarding all these.

If renting through an agent, it is common for the agent to collect 1 month deposit upon signing of the offer. This will basically be converted into their commission upon signing of the tenancy agreement. You have the right to request that your lawyer draft the tenancy agreement to better protect your interest. Normally tenant pays for the legal fees and stamp duty, so do insist on your own lawyers.

Advisable not to use agent's tenancy agreement templates. Normally, it will be badly drafted.

For clean up, subject to negotiations and agreement. No fixed rule on this.

1 week buffer - again, no fixed rule on this. Strictly speaking, landlord does not have to hand the keys over to you earlier before commencement of the tenancy.