I´ve probably got a bit more experience cooking with herbs and spices than you, because I´ve been around since the Queen, RIP, was crowned.
My suggestion is to look on the web and find simple recipes with herbs/spices. For example, a tomato sauce with basil or oregano. A simple sautéed courgette recipe with cumin seeds. Potatoes with dill, or mint, or just parsley. A lentil dhal with turmeric and chiles.
You could also google things like "what goes with marjoram?" or "cooking with coriander" or " best recipes with black pepper", things like that.Start simple; look in the supermarket to see the most common herbs and spices and avoid esoteric products like, for example, borage, savory, epazote, ajwain, nigella, black cardamon seeds and yes, wattle seeds. Start with the easy stuff.
Gradually you will build a herb/spice memory and will understand instinctively which herbs/spices go best with which food item. I would not suggest buying a herb/spice bible quite yet, until you´ve got a basic knowledge of the simplest items.