Answer by taking a quote from the following article:

Nickolas Gene Carter was born in Jamestown, New York, where his parents, Jane Elizabeth Schneck (nee Spaulding, previously Carter) and Robert Gene Carter (1952-2017), owned a bar called the Yankee Rebel. His mother is a Welsh, Irish, German, English, and a quarter American descents. Several years later, the family moved to Ruskin, Florida and managed the Garden Villa Retirement Home, where they added to the family. Carter's siblings are Bobbie Jean, (born January 12, 1982), Leslie (June 6, 1986 - January 31, 2012), and twins Aaron and Angel (born December 7, 1987).

In 2002, when the Backstreet Boys expressed a strong desire to leave their management company, The Firm, Carter chose to remain with them to manage his solo career. As the group began recording their new album without him, he started working on his first solo album. Now Or Never was released on October 29, 2002, and it reached No. 17 on the Billboard 200 chart and was certified gold, both in the United States and Canada. The lead single, "Help Me" achieved considerable worldwide success while the other single, "I Got You" was a minor hit in Europe. The album made the charts in many countries as well. He also launched a worldwide tour in support of the album. He was No. 9 of People Magazine's "50 Most Beautiful People" in 2000 and Cosmogirl magazine's "Sexiest Man in the World" in 2002, beating out such competition as actor Brad Pitt and rival pop star Justin Timberlake for the title, launching a media-hyped "rivalry" between Timberlake and Carter, culminating in an amicable 2009 meeting off camera on the set of Late Night with Jimmy Fallon where Carter defeated Timberlake in an arm wrestling match. "Man of the Moment". Archived from the original on April 11, 2013. Nick began work on his second solo album in 2003, but the recordings were aborted when the Backstreet Boys returned to the studio. One of the tracks from the earlier recording sessions was used as the theme song to the television series House of Carters in 2006. "Let It Go" was written by Nick Carter, Matthew Gerrard, and Bridget Louise Benenate. Carter recorded a duet with pop singer Jennifer Paige called "Beautiful Lie" in 2009. In 2010, Nick Carter started recording new songs for his second solo album, working with Rami Yacoub, Carl Falk, Toby Gad, Josh Hoge, Claude Kelly, among many others. Carter's new album titled I'm Taking Off, was released on February 2, 2011 in Japan, in Germany on June 3, 2011 and in the USA via iTunes on May 24. As of June 2011, Nick's second solo album reached No. 8 in Japan, selling over 20,000 copies. In 2014, Carter recorded a duet album with Jordan Knight from fellow boy band, New Kids on the Block, titled Nick & Knight which debuted at #24 on the US Billboard 200 and #14 in Canada. The tour to support the album ran through September-November 2014. On September 22, 2015, Carter released the first single from his new album, entitled "I Will Wait" on Vevo. The new CD, All American, was released on November 25, 2015. In support of the album, Carter toured in February and March 2016. CANNOTANSWER

what was his first solo song?

The lead single, "Help Me" achieved considerable worldwide success while the other single, "I Got You" was a minor hit in Europe.