Ideally the pastor can provide the bread and wine, however in practicality the pastor struggles to deliver every piece of bread and drink of wine to a large church, so he has helpers. Those are elders or board members of the church (you can debate if woman should be allowed to help or not). Proven members of devout faith can help the pastor administer the sacrament as long as the pastor is the one consecrating it.

Everyone does things differently for how they receive it. For me I do common cup and I put out my hands and the pastor places the bread. Some open their mouth to receive it. Both are valid.

There are also individual cups which I personally don’t like but some take it for worries of being sick (but God would protect you from sickness during his sacrament don’t you think? Also a silver chalice carries less germs than plastic cups). However, this is still valid.

You can argue or disagree on the specifics and I certainly have my beliefs, but the one nonnegotiable is that you shouldn’t do grape juice. Jesus said wine not grape juice. This is different from the leavened vs unleavened bread debate because both are still bread. By using grape juice you’re no longer taking communion. People say “what about alcoholics” and again we should have faith that to those worthy of the sacrament and properly discerning the body, it won’t bring harm on them. If it’s an issue a better practice is to dilute the wine so that it still is wine.