For the F thing, for example in iD:
- create a new object
- click a node on an existing node of a nearby way (the tool now which line you want to follow)
- click on a consecutive point of that way (now it know in what direction to follow)
- type F for as long as you want to follow
- at every "junction" of lines you'll need to chose which line to follow next, by simply clicking again on the next node you want to follow