John 1:40-42 The first thing

⁴⁰ Andrew, Simon Peter’s brother, was one of the two who heard what John had said and who had followed Jesus. ⁴¹ The first thing Andrew did was to find his brother Simon and tell him, “We have found the Messiah” (that is, the Christ). ⁴² And he brought him to Jesus.
Jesus looked at him and said, “You are Simon son of John. You will be called Cephas” (which, when translated, is Peter).

The first thing.

The most important thing.  Priorities. I think that Andrew had it right.

Andrew was never known as a great scholar, a respected teacher, or a powerful person. He was primarily known as "Simon Peter's brother."  But the most important thing that Andrew did, after meeting Jesus himself, was to bring Simon Peter to Christ.
Andrew had met Jesus through the witness of someone he knew - John the Baptist. And he immediately got busy bringing others to Him. He made it top priority; we know that because John writes that the "first thing" Andrew did was to find his brother. 
To me, this means that he had to actively go and look for him. This took some effort. He wasn't standing next to him - Andrew needed to search. And when he did, he told him they'd found the Messiah. He may have blurted out the news as fast as he could; he may have been breathless from his search for Simon. 
He followed up with bringing Simon to Jesus.

As a side note, I think it is wonderful that later on, we see Andrew continuing his ways: in John 6:8, he brings a boy to meet Jesus, and in John 12:20-22, he brings some Greek people to Jesus. 
What an example for us!
God can use us, ordinary people, in extraordinary ways. Our relationships with other people are key to our finding, telling, and bringing people to Jesus. Each of us can be like Andrew by praying for ones that we know need Christ, and then telling them about Him.

Do we have the same excitement and urgency that Andrew showed, as he searched for, and then told his brother about Jesus? How long has it been since we told someone about our Savior?