Do you mean spell casting or your pagan path? Spell casting can be done whenever you feel the need. Your spirituality might be harder. Try reading some books for ideas. Few things you could try include: praying to your specific deity daily. Could be when you wake up, before going to sleep, or before meals. You could pray once or multiple times, whatever works.
offerings. These could be daily, or once a week/month. Try lighting some incense on Saturdays in your room and dedicating it to your deity. You could use a number of things for offerings but incense is easiest.
daily/weekly nature walks. Take this time to be without electronics and just observe the world around you. If walks aren't your thing, sitting outside in your yard or park works too. The key is to relax and observe.
meditation. There are many ways to meditate, so look into it further. Like with nature walks, you should take a moment to relax. This can help in many ways, but you can connect with yourself and the gods through meditation.
mindfulness. This one is a little broader, basically being aware of things. If you're eating a salad, try to visualize/think of where the food came from. It's easier if you grew it yourself than if it's from a grocery store, but it should say on the package where it's from. Try eating foods in season, to better connect with the seasons. [In the winter, go with frozen produce unless your area is tropical] eating is just one example, try to observe and understand the change around us. Though eating healthy can be another great point
There are many others too, you could read books, work on your Book of Shadows, study herbalism, astrology, divination, or a thousand other topics which interest you. Start by getting a journal [Or piece of paper] and write down your daily routine for a week. [Like wake up at 7, eat breakfast at 7:30, go to school at 8, lunch from 11-12...] You will probably find large gaps where your day is filled with free time [from 3-7 computer for example] try scaling back on the time wasting activities to make room for meditation or reading or something similar.