I use scales, to get the best measurements, but you can use teaspoons for the salt , sugar, and yeast, 1 teaspoon equals 5 grams approx; but you are best to weigh with scales..
If you cannot weigh a small ammount on your scales, then weigh say 25 grams and divide
it into 5 portions, 1 portion being 5grams ...come back if this is not clear to you..
happy cooking
VIV