A: Generally, inks used for no-line coloring are pale and tend to "disappear" when colored over. Any pale ink can work, though you'll need to choose an ink that is compatible with your coloring medium. I have used pale yellows, pinks, and greens as well as neutrals (beige or grey). As for specific brands, I usually reach for either the Impression Obsession Mist Hybrid ink or Ink On 3's Fadeout ink (also a hybrid) - they are about the same pale neutral grey, and will not bleed when used with watercolor or alcohol ink. The Fadeout lines soften and blur after some time, adding to the no-line effect - that is a unique feature to that ink. Check out these no-line coloring techniques:
No-Line Coloring
No-Line Watercolor

A: You can make do with a ruler and a tool like a ball stylus or bone folder. Place your cardstock on a foam pad or another surface with a little give to allow the cardstock to press down where you make your score line. Measure and line up the ruler, then run the tool along the edge. If you have a paper trimmer with a groove for cutting, you can use the groove to help guide a bone folder or stylus for scoring too. Some trimmers have optional scoring blades.

A: If you don't want a frayed look, I would use a double-sided iron-on adhesive like Wonder-Under - you can apply it to the fabric with a dry iron, cut it to the size or shape you want, then peel the backing paper and adhere it to a cardstock panel in the same way. You can stitch fabric to cardstock as well - I'd use a light adhesive (double tape or glue stick) to hold it in place while you're sewing. Also, make sure to dedicate a sewing machine needle to use only on paper - it will dull more quickly in paper than it will in fabric. We have a tutorial for sewing on paper HERE.

A: You can. I'd be sure to use water-soluble glue, and I'd brayer it into an even layer on a gel plate and work quickly to lift and apply it with the stamp, then clean both surfaces right away. The stamped image would dry quickly and be useful for resist techniques. (Here's an interesting glue tutorial I found today!) If you're wanting to use the stamped image to adhere glitter, you might be happier with the results of sticky embossing powder.

A: We do have a few tutorials!
Quilling
Quilled Flower Bookmark
Quilled Images
For basic quilling you'll need a slotted quilling tool, paper strips, and glue. If you get more into it, there are a variety of forms you can use to shapes your pieces.