It is not all that confusing.

FIRST, PICK YOUR PLAN  You pick the pre-paid plan you would like to have.

Options for basic phones include:

$50 unlimited plan = $50 will be deducted from your account each month. You need to make sure you have $50 in your account when your monthly renewal date comes, or your account will either be terminated or you will be switched to a plan which your balance will cover.

$1.99 daily plan = unlimited minutes, $0.02/$0.25 text/picture messaging, $0.99/day for mobile web. If you have no usage at all on a specific day, there will be no daily charge for that day.

$0.99 daily plan = unlimited mobile-mobile minutes, $0.10/minute all other calls, $0.10/$0.25 text/picture messaging, $0.99/day for mobile web. If you have no usage at all on a specific day, there will be no daily charge for that day.

per minute plan = $0.25/minute for all calls, $0.20/$0.25 text/picture messaging, $0.99/day for mobile web.

SECOND, FUND YOUR PLAN  You fund your account with the refill cards as you have linked to on Walmart. As listed on the card it says

"REFILL CARD

Pay for all your Verizon prepaid services:

UNLIMITED

TALK, TEXT & WEB"

Translation would break down to being able to pay for your "UNLIMITED" plan OR your "TALK, TEXT & WEB" plan. This card is ONLY used to fund your account. It does not put you on any specific plan. You purchase the card, THEN you add the funds from the card into your account. The funds added to your account expire at different times depending on how much you add to your account.

$15 - $29.99 expire after 30 days

$30 - $74.99 expire after 60 days

$75 - $99.99 expire after 90 days

$100 or more expire after 1 year

The money in your account will then be put towards whichever plan you happen to be on at the time. The amount in your account will need to be sufficient to cover any expenses your plan requires or you will automatically be dropped down to the next plan which WILL be covered by the amount available in your account.

THIRD, USE YOUR PLAN.

You may want to note, I am unaware if taxes would be in addition to any plan prices listed above. You should probably keep a surplus in your account to cover any taxes/fees needed in order to ensure your plan does not change because you do not have sufficient funds to cover your plan costs with taxes. At least until you know how much you will need each month.