~which of this will you advise a newbie to football getting to choose from?
Basically, it should depend on the newbie's insight about football competition.
But commonly, local league (EPL, La Liga, Bundesliga, etc) is easier to predict than the international competition (UCL, UEL, etc). In the local league, we can learn the history of each team perfromance. Before placing a bet, we should analyze the results of the last few matches got by each team. Sometimes, the result can be a bit easy to predict. While for international tournaments, the results mostly are unpredictable. So, it can be a bit difficult for a newbie to place a bet.