1. landscapes mostly look better kneeling, and sometimes lying down. unless you have a wide angle they rarely look good standing up.
2. unless your shooting close ups, stick to the rule of thirds until you know better. If you are shooting an extremely small subject matter against a very large background, you can make this into the rule of 5ths to potray distance (make sure your subject stands out though).
3. shooting in broad daylight is the easiest, with the least intresting colors. Bracketing is not neccary. Next comes morning/afternoon.
Don't put blind faith in your light meter at twilight or sunrise/set. make sure you bracket, and get separate readings for the ground and sky.
4. Shooting silhouettes against a setting sun is fairly easy, shooting a properly composed subject during a setting sun is hard.
5. Always bracket with time exposures and medium to low light.
6. Broad daylight will have boring colors. Night time, or dark shots, especially longer exposures will bring out the vibrant colors. That sweet spot occurs around 1/4-1/8 second, with ISOs 100-400, this is where you melt your colors into the visceral.(check your film/sensor type, mileage may vary)
6. Get to know your light meter and its limitations. I expect you kids with your fancy schmancy 90%/%10 new fangled 32 point light meters to have it easier. Still, at dawn/dusk your light meter is not to be trusted, and only used as a ball park. Bracket like a motherfucker, and let your intuition tell you what to do.
Learn how to best utilize the gear you already have, instead of thinking that a new piece of gear will fix everything. I've never seen people learn artistic, or photographic skills overnight, just because they got a shiny new piece of gear.
For me I find breaking down a big problem into smaller problems easier to work with. I'd recommend you try and learn just one part of the camrea at a time, trying to learn everything or a lot in one go could lead to dissapointment.
Do what you want. Don't ask others what you should do, ask you what you want to do. That includes improvements. Unless you don't know the basics. Once you know the basics though, just find your own way. Everyone here has their own opinions and styles so you probably won't get a solid answer other than keep trying.