We are not allowed to give you specific advise on dosages. It's recommended that you contact a doctor who can give you professional advise.
We are not allowed to recommend you any product. It's best to find a professional who can point you to the right direction. The net also hosts a bunch of credible websites worth visiting, like the Project CBD website: https://www.projectcbd.org/
Basically, product consistency and CBD concentration. Extracts contain more CBD in a single product, so they are more concentrated. The consistency of extracts is creamy while drops are liquid.
It depends of the time you've placed your order. Orders placed before 1 pm weekdays are dispatched the same day. Orders placed after 1 pm on Friday and on weekends are sent on Monday the following week. You can always ask for your tracking number to see the exact location of your order.
You can, but only to the courier at the time of delivery.