You are growing is soil right?

How much perlite did you add? If you don't have proper drainage then yes you are seeing an over watering problem. If possible drill a bunch of holes in the bottom of your grow bucket to drain the excess water out faster. You don't want it sitting in the bottom of the bucket, that will cause problems with your grow over the long haul.

You can prop up your bucket and crawl under it to drill the holes if you need to.

Yes you water until it runs out the bottom but that is only if you have proper drainage.

The next issue you will be dealing with will be fungal gnats from excess water in the soil so watch for them on top of your soil. To try to avoid that problem you may want to put construction sand on top of your soil now. The sand cuts them to death as they work their way to the service most of the time. They eat the roots of your plant so if you end up with them you can deal with the pretty easy.
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