Hi, Deb.
I believe it is important to use brand names when it comes to needles and thread. I have used both Organ and Klasse as well as Schmetz.
Titanium coated embroidery needles are advertised as lasting longer and better to use when adhesive is use to stabilize the item being embroidered. I use this type of needle and prefer it. The adhesive I am referring to would be in the form of temporary spray adhesive for sewing or sticky backed stabilizer.
I have not used ARC brand, but have used Madeira and it is a very good brand, I also use C&C and Sulky, but not black as this color thread is weaker than that of other brands.
I would avoid buying sets of thread unless the colors are those you know you will use. I stock up when JoAnn Fabric has thread on sale.
The poly thread stands up to bleach. I use rayon as it is what is more readily available (for me) and I use bleach with care.
I use NEB prewound bobbins instead of buying bobbin thread and winding my own bobbins.
There are many, many sties that sell embroidery supplies. AnnTheGran, Allstitch, Allbrands, ShoppersRule and The Sewphisticated Stitcher are a few that I trust.
We have been advised to stay away from embsupply.com as it has been proven to be a scam.
I would also be careful of individuals selling on Ebay (although I am an occasional seller and buyer of other items).
I am a believer of PayPal and many merchants including AnnTheGran now offer this option of payment.
I am sure there will be other's who will provide you with their preferences, so stay tuned!
Pattiann