As you start developing a line, I dont think its fair to suggest how many traps and how far apart to set. One thing I found to be beneficial is to go overboard with the sets during your initial line, and see what sets and locations work, and what doesnt. Do you want to have many stops within close proximity to the road, or will you be working further away from the road, hiking to fewer stops? Either way, make sets wherever the sign or structure dictates within a reasonable range. (Thats a whole different topic, and one thats best understood through a book or 5 ) By gang setting locations, you will not only understand what type of sets work for you, but youll also be able to thin the numbers of traps down to the proven ones in the following seasons. This helps you learn, and proven set locations seem to keep producing year after year. I dont want to suggest you only set the proven locations and accept that as maximizing your production, but it is a good way to start getting the most efficiency on your route. I always have a few experimental sets out along side the proven to continue learning and understanding movements. After a few seasons of doing this you will be using fewer traps, have confidence in your sets, and may even afford you the time to expand your range. Youll also learn to pick out good sets quickly at new areas by the experiences you have on the existing line. Just my opinion, but I think going about it this way has helped me a ton!
Welcome to the site. Many folks with much more knowledge than me kicking around, and more than willing to help you get started!