I need your suggestions on protocol
Looking back at my first suggestion I don't think I made adequate allowance for your need to gather history, nor for the fact that (if I understand your claim correctly) it's changes in skin temperature rather than absolute skin temperature that you believe shows the effect of the homeopathic remedy.
So here's a second attempt at a suggested protocol:
Day 1
1. At time X (to be specified by you) measure and record the skin temperature of the volunteers
2. At time Y (to be specified by you) measure and record the skin temperature of the volunteers
Day 2
1. At time X measure and record the skin temperature of the volunteers
2. The volunteers then consume your chosen homeopathic remedy
3. At time Y measure and record the skin temperature of the volunteers
You may need to repeats Days 1 and 2 a few times to collect sufficient data. That's OK, as long as you specify in advance how many times you intend to repeat them.
When you are ready:
Day 3
1. Ten placebos and ten homeopathic remedies are prepared and labelled, the labels covered up and the bottles shuffled.
2. At time X measure and record the skin temperature of the volunteers
3. The volunteers then pick a bottle at random and consume the contents
4. At time Y measure and record the skin temperature of the volunteers
5. State which volunteers you believe took the placebo and which the remedy
6. The labels are removed and if you correctly identified more than N (number to be agreed between you and JREF before the test is run) you are deemed to have passed the preliminary test
For the final test (assuming you pass the preliminary) it should only be necessary to repeat day 3, with perhaps a higher value for N (again agreed between you and JREF in advance).
Does that sound like something approaching an acceptable protocol?
I also want to conduct some more preliminary tests as per your suggestions
This is good to hear. I strongly advise you to do a version of this test (using fewer volunteers perhaps) as soon as possible. The results may surprise you, and save you a lot of wasted time and effort.