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? 
Yeah minimum wage it's not the greatest I mean it is lowest remuneration from employers but yes indeed the tips made up for it I had some good nights and yes 21 and older being you handle alcohol at times. 
Ah ok I figured that, Do you have any other useful tips I need to know before getting a job as a barista? 
Just practice at home before applying if you can just to get the hang of it making espresso and drinks is a skilled task.