MJ have you googled bread? There are many sites full of knowledgeable people. I have been on some American ones, that work for me because I use fahrenheit on my oven.
You are going about it the right way, trying to find out what works, but some basic information really helps.
You could try googling breadtopia, or freshloaf. Both are good bread sites.
Packages of yeast have 1 ounce, 2.5 tsp. in each. 100C is boiling point or 312F. Yeast works well in temperatures that you would heat a baby's bottle to, about 38C. You need a little sugar and a little salt in your bread for the yeast to work well. Your first loaf probably had too much flour in it. Kneading without using too much flour, just enough to keep it from sticking to the counter will produce a better product. If the dough is too stiff to knead, let it rest under a bowl for a few minutes and then try.