This is a perfect way to ensure you continue to have zero success growing.
But if you wanna give it a go anyway.. here is some help.
Cut holes in the bottom of the solo cups so water can drain well.. don't water them too much when they start out in the solo cups. You want to add small amounts, not huge cups of water at a time, when they are seedlings. Also keep the lights at a proper height and setting, and keep the room around 75-80f with plenty of good air flow.
As they grow up, and get to where they are about 12" tall, switch the lights to run 12 hours on and 12 hours off. Unless you are growing autoflowers then all of this is a moot point.
When they are in 12/12 lights, you will want to water them well and often. They will begin to drink faster than you can keep up, so a good trick is to both top water by pouring it into the solo cup as well as watering from the bottom. Place the solo cups into a plant tray or any container that does not have holes that will drain the water out.. add the water to the container or tray, add solo cups into it and the plants will soak up the water from the bottom. About 1-2" deep in the trays works best. Not too much, not so little that it doesnt even help is key.
Essentially let them grow and don't mess with them all the time. New growers constantly make the mistake of overthinking stuff.
When they reach the recommended grow time (8 weeks, etc.), harvest them and enjoy your first successful grow.
Most important.. don't give up. Growing is easy once you know how and understand things based on past mistakes you have made and lessons others have taught you.
