if u need the resort u have to make a prior reservation this is the number 4765299 u have to pay at the merweb hotel or just when u reach there pay it or use ur credit card .
and if u just want to go to sealine beach no need for a reservation or whatever as long as u know your way to there.
and if u want to have a planned trip call QIT Qatar International Travel agency and they will plan a good trip.
hope that i answered your question ;)