This I think is the best way to start, as you don't miss taking what your body may need the most. Also there is a holistic effect with nutrition so you get the most mileage with a full spectrum supplement program rather than just a few supplements. You need to examine the overall diet to really get the most out of your food and the supplements that are taken. The worst problem is under nutrition, not getting what you basically need. Only after that should the concerns of a mega supplement program be addressed.
Some multi supplements can also have some amount of plant extracts.
Plant extracts present a very difficult case because there can be both nutritional and drug like actions with plants extracts and there are so many to chose from. After taking a good multi supplement you can think about extra protein supplements, herbs, special oil supplements like CLA, GLA, Fish oil and the like. Then there are the special types of carbohydrates not found in the diet in large amounts and other special ingredients like Lipoic Acid. With all this in mind you can look into special nutritional programs to help elicit the nutritionally augmented training effects you like to have. Buy from a good quality company, you can hopefully get better purity and formulas for multi ingredient supplements.