Took the plunge...

[divinehope]

Good advice, so where/how do I change classes? I believe its just a weapon swap correct? Where do I get some starter weapons/armor?

[Eldaena]

Good advice, so where/how do I change classes? I believe its just a weapon swap correct? Where do I get some starter weapons/armor?

There are different NPCs in each city that can sell the weapons. They are usually called "weathered" <insert name of weapon.> Sometimes you can get them from completing level 1 leves too. When you find one, either purchased from NPC or gained as a reward, just go to the gear tab on you menu. Click on the main hand and just switch the weapon. You'll change classes automatically. Each class has a different ability set and you'll need to set up your bars. Also, each class allows you to allot a few points too.

Edit: Also to change actions and traits go to that tab on your menu. As you gain more levels you'll learn and be able to equip more and more. =)

[Geesus]

Good advice, so where/how do I change classes? I believe its just a weapon swap correct? Where do I get some starter weapons/armor?

Correct! Try using these resources for help with finding things.
Yellow Gremlin Slightly outdated but you will find the answer to your question regarding starting weaps.

Disciples of The Land

Moogle Box

FFXIV DB

And of course

Lodestone

Good luck!

[Fiosha_Maureiba]

Good advice, so where/how do I change classes? I believe its just a weapon swap correct? Where do I get some starter weapons/armor?

In the same area where you picked up your leves, there should be one or two merchants that will sell starter weapons and armor. They are in the same room, usually two NPCs behind the counter as well.

[Kiote]

Good advice, so where/how do I change classes? I believe its just a weapon swap correct? Where do I get some starter weapons/armor?

There is an NPC vendor at every adventurers Guild that sells every starting Weapon and Tool.