Let's see here:
1) You soak the netting in the 50/50 water/white glue mixture, then ring it out to remove the excess, then place it in the form that you want it (i.e. if it's to be draped on top of a turret) go ahead and draped it on the turret. Don't worry about the excss dripping on your model, it is very easy to remove.
2) Not sure what you mean be thicker line things but if you mean tie downs I use thin twine that you can find in any hardware store.
3) The tarp is made exactly the same way as the netting, just be careful to not rip the tissue when you are forming it. If it is blanket over top of a figure, just draped it in place while it is still wet, it will dry into form.
Hope this helps