yup plain whole yogurt is so versatile! You can always add jam or honey for a sweet tooth. Plain is also great with curries. A good yogurt has no thickeners like corn starch (eew!) or added sugar.
Sure! My best tip is this: use store bought yoghurt as "seed" to make it the first time. Less hassle and there is no difference.
Also, if you like Labné like me, freeze your yoghurt until rock hard, thaw at room temp using a cheese cloth to strain the liquid and form balls with the resulting paste. It is my favorite treat with olive oil and oregano.