THIS is the first of a series of talks, which will take place on Wednesday evenings during April and June, designed primarily for listeners between fourteen and eighteen, on such varied subjects as jobs and camping, foreign travel and keeping fit. Today's talk starts the series well, for followers of the game will admit that no more sporting player than Charles Buchan , the Arsenal skipper, ever led a team in a Cup-tie or won a First League match off his own boot. There will be a big audience of London football enthusiasts to hear him broadcast tonight.