Can I use paper for this?

You can use rags instead. However, paper towels are not going to leave fibers behind that could later block your gun when it is in use, causing you to strip...

The idea is the same on any paper. The grid is only to help get the lines exact. If you struggle drawing it without a grid at first, you can...

You can, it just won't be as flexible when you fold it. I'd recommend not adding stems, as that will put more weight on your flowers.

Tape will not last as long as glue, especially a glue made for paper. There's no reason you can't use origami paper, though.

Origami paper is thinner than most other paper, and would fold much more easily than writing paper. Gift tissue might work if it's not too soft.

Yes, you can use any paper that is easy to handle (printer paper, construction paper, etc.). But make sure that the paper is a square and has equal sides (unless...