Thomas Lawton was born on 6 October 1919 to Elizabeth Riley and Thomas Lawton senior in Farnworth, Lancashire. His father was a railway signalman of Irish extraction, and his mother worked as a weaver at Harrowby Mill. His father left the family 18 months after Lawton was born, and Elizabeth moved back into her parents' home in Bolton. Elizabeth's father, James Hugh "Jim" Riley, became Lawton's surrogate father.

Lawton played his first game for Burnley Reserves against Manchester City Reserves in September 1935, and though he struggled in this game he went on to become a regular Reserve team player by the age of 16. After a poor run of form from Cecil Smith, Lawton was selected ahead of Smith for the Second Division game against Doncaster Rovers at Turf Moor on 28 March 1936; aged 16 years and 174 days, this made him the youngest centre-forward ever to play in the Football League. Rovers centre-half Syd Bycroft, also making his league debut, marked Lawton out of the game, which ended in a 1-1 draw. Burnley had played poorly, though Lawton was praised for his "keen and fearless" performance by the Express & News newspaper. He retained his place for the following game, and scored two goals in a 3-1 victory over Swansea Town at Vetch Field. He picked up a groin strain in his third appearance which caused him to miss two fixtures, before he returned to the first team for the final four games of the 1935-36 season; he claimed three more goals to take his season tally to five goals from seven games.  Lawton continued to train his heading skills intensely in the summer of 1936, and also played cricket for Burnley Cricket Club as a batsman in the Lancashire League. He scored a six against both Learie Constantine and Amar Singh. He scored 369 runs in 15 completed innings for an average of 24.06.  He turned professional at Burnley at the age of 17 on wages of PS7 a week. His grandfather attempted to negotiate a PS500 signing-on fee on his behalf but was rebuffed after the club alerted Charles Sutcliffe, Secretary of the Football League, who informed them that any attempt to circumvent the league's maximum wage was illegal. Lawton scored in his first appearance since signing the contract after just 30 seconds, before going on to record a hat-trick in a 3-1 win over Tottenham Hotspur, scoring a goal with either foot and one with his head.

When did Tommy play for Burnley?
Lawton played his first game for Burnley Reserves against Manchester City Reserves in September 1935,