My very first job was as a barista serving espresso coffee drinks. 
that sounds like a great job to have, I myself have been interested in becoming one, Any tips I should know? 
Yes just know the different type of behind the counter drinks to serve that is popular like hot drinks,cold alcoholic and non-alcoholic beverages.
Indeed I'll have to learn the ropes and I'll get the hang of it, What is a baristas salary? do they make a lot? 
No it's not no 7 figure job it's a typical bartender like job about minimum wage but tips is how we made our money you may make more working at Starbucks coffee company honestly but it still was very fun. 
Oh yeah I should have figured that tips was the majority of the pay, What age do you have to be to be a barista, I assume its 21 or older?
Minimum wage
A minimum wage is the lowest remuneration that employers can legally pay their workers—the price floor below which workers may not sell their labor. Most countries had introduced minimum wage legislation by the end of the 20th century. 
Supply and demand models suggest that there may be welfare and employment losses from minimum wages. However, if the labor market is in a state of monopsony (with only one employer available who is hiring), minimum wages can increase the efficiency of the market. There is debate about
Barista
A barista (; ; from the Italian for "bartender") is a person, usually a coffeehouse employee, who prepares and serves espresso-based coffee drinks.
Etymology and inflection.
The word "barista" comes from Italian, where it means a male or female "bartender" who typically works behind a counter, serving hot drinks (such as espresso), cold alcoholic and non-alcoholic beverages, and snacks. The native plural in English is "baristas", while in Italian the plural