some people use a hoop- some do not - that is a personal choice-
single thread- not doubled-
baste well- don't worry about managing some specific number of stitches per inch- try to be consistant- so the stitches on the top and bottom look the same- and the stitches are even.
there are some very good tutorials/videos showing hand quilting-and many different (ways) to do it- some people stab stitch (meaning they make one stitch at a time-poke through top to bottom- poke back through bottom to top--
some people do a rocking stitch and (load) 3-5 stitches on their needle at a time---it takes some practice to get the hang of doing it-
there is a product called tiger tape- which comes in various widths, like 1/8" or 1/4"- it has little lines on it- you can lay that along the lines you want to quilt and use it as a guide to help get the stitches consistant and even-
start in the center-and work your way out
if you choose to use a hoop- the fabric should not be tight (like it is when embroidering) it should have (give) but be smooth--some people hoop then put their fist in the center and push down to give it the (give needed) before tightening their hoop--
if you find the hoop too awkward try it without- (as long as it is basted well)
if you enjoy hand piecing you already have the hard part figured out-
and if you find those betweens (difficult) try a longer needle--not everyone hand quilts with tiny needles- some great hand quilters use straw's or milner's - sharps are another option- just make sure to use the correct needle size for your thread...so it doesn't fray.