Nothing is more annoying to your fellow passengers than standing in the aisle forever waiting for you to store all your luggage and getting settled down. Just sit down on your seat and wait until everyone is on the plane, then there is more than ample time to sort out your luggage and store it away properly. Seating For short flights it might be nice to sit at a window to take in the scenery, but for longer flights an aisle seat is preferrable. You are not going to see much anyway, because most of the flight will probably be at night or over water or clouds. If you want to see something you can always get up and look out the windows at the doors.
Different aircrafts have different seating layouts.
Try to get a seat at an aisle. This will allow you to get up anytime you want without waking up your sleeping neighbour or climbing over food trays. Seat C and H are the best seats. You are sitting at the aisles, you have at least a bit of a view through the window and it is the best position to watch the movie screen. Second choice is D and G, which are still aisle seats, but don't have the other advantages.