What do I need to apply for a visa credit card?

I’m currently employed. I only have a savings account, but I don’t have a checking account yet. I want to apply for a credit card at my local bank, but i don’t know what I’m going to have to know and need first. I want to be prepared. Thanks for the answers.

Do i need to be 18 to apply for a visa or a Mastercard credit card?

i am 17….turning 18 in a month.. could i apply online for a credit card? even tho im not 18 yet.? i would have sum1 check it out for me to make sure im not getting screwed over but yea… will they send me one if i apply?