Services in the sales order

Hi,

We have a requirement to implement order management to a computer service center..

Once a client comes to the service center sales representative will start the job.

Sales person inspect the laptop. If there is a requirement to insert a new part (Eg.RAM) he will do the needful to apply the new part.

If there is a service charge we have to add such charges into the sales order.

We are planning to create a service item (non inventory). So in the same order customer can enter item details , service details.

Can anybody comment on the item attributes we have to enable for a service item.