Dome up for all readings as you start out.
A number of situations may cause problems or doubt e.g. mixed outdoor light, dark vs light areas, changing light... . Ideally a spot meter is best here (this will not be in your immediate repertoire, but if you stick to the game, it certainly will be in the future), or a meter with memory function (IIRC the L308S does not have a memory function). Just step back and examine the scene, and if you wish, grab the bull by the horns and meter however you see fit. Again, keep notes of what you are doing and refer back to these at the lightbox. As they say, "it will all come out in the wash!".