Editing takes a lot of practice, to find your rhythm, to be able to cut the fat, to use only good video and audio, to have a beginning, a middle and an end, challenges and resolutions, clearly enunciated ideas and visuals, and that's just the theory, and not even the logistics of the software.
To get going, here's a really good video tutorial on editing with Premiere.
Here is Adobe's own tutorial to get started. Here's a "crash course" which includes cool drone footage in Nevada.
Keep Thinking of Audio
When editing, you have to think of your audio first, and making the audio track seamless. Check back my primer on audio editing. Mix your shots in logical, sequential, story building order. Establishing shots, detail, action, quote, explanation video, another action shot with nat sound, explanation video, more quotes, ending shots .... Shots should succeed each other in a way which is visually pleasing, use natural wipes (such as a bus passing in front to transition during a street scene), go from wide shot to closeup of the same scene, avoid jump cuts, and have lots of variety and your edit should work really well.
Have Fun, Be Creative, Keep Saving, Find Your Own Way
Have fun while you edit, and don't let technological / software problems get in the way of your creativity. Google or use Adobe's search function when you run into problems and headaches, and find the keystrokes and workflows which suit you the best. Keep saving your work. Make sure you are always working in a specific, well-named folder on your hard drive. Make sure to finetune the audio. When you are satisfied, step away as you may be able to trim more of the fat if you give your work some fresh eyes and ears. When you are really ready, export.
If you enjoyed this tutorial, make sure to check out the other chapters in my video series.
Teaching Video, Part 1 -- Your Equipment and How to Use It
Teaching Video, Part 2 -- A Lexicon of Shots
Teaching Video, Part 3 -- Shot Composition and Sequencing
Teaching Video, Part 4 -- Nat Sounds and Action Shots
Teaching Video, Part 5 -- Interviews
Teaching Video, Part 6 -- Standups
Teaching Video, Part 7 -- Choosing Your Video Stories and Shooting Them Wisely
Teaching Video, Part 8 -- Ingesting Into Premiere
Teaching Video, Part 9 -- Writing Your Script
Teaching Video, Part 10 -- Editing
Teaching Video, Part 11 -- Raising Your Game