>> “Who gave Jesus his authority?” <<
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The Father
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>> “Who can baptize and what is the methodology?”
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Anyone that has the Holy Spirit can baptize.
One simply plunges into a running stream, head up stream, and allows the running water flowing over to symbolize the washing off of past sins, and the sin nature.
This must of course be accompanied by belief that these things will happen, confession of sins and sin nature, and sincere lifetime walkout in faith.
>> “Which commands/ordinances are they to obey?” <<
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In our time, all that are personally applicable. The Temple ordinances were suspended until the millennial kingdom, due to the removal of the vail and destruction of the Temple.
The rest of the commandments are to be learned gradually over time, just as they were at Moses time, by hearing them read in your place of worship.
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I've shown you from Gods' word that the commandments are not the same as the "book of the law" nor was it to be treated the same.
Deu 31:26 Take this book of the law, and put it beside of the ark of the covenant of the LORD your God, that it may be there for a witness against thee.
The ten commandments were put inside the ark and are forever. The book of the law was put beside the ark and are not in affect during this age of grace. To try to combine them contrary to God's word is not wise. Nor is it wise trying to put people back under the law.
1. How do I identify a person (male or female) with the Holy Spirit's authority to baptize?
2. Can it be still water? Salt or fresh? Must it be full immersion or can I just sprinkle the water?
3. To whom would the baptizee confess their sins to? What is "a sincere lifetime walkout in faith and how do I recognize it?