This is a simple guide explaining the game HUD, jobs with their skills and how to get them. For more in depth guides check out these:

Farmer Guide
Tamer Guide

Game HUD

Basic Display

Character Menus

Spoiler: show

Passive and Collection Jobs

Character: Base Job

No skills - Leveling adds more energy.
All actions seem to give this exp.

Scavenger: Starter Job

Scavenge - Free - Starter Skill
Find items on lands.

Keen Eye - 1,000g - Level 3
Adds chances for better items and higher amounts of gold to scavenge.

Freeganism - 10,000g - Level 5 Scavenger + Tamer Job
Adds the chance to find food.

Merchant: Starter Job

Market - Free - Starter Skill
3 slots to use to sell things in the market.

Market Slots - 1,000g - Level 3
3 more slots to use to sell things in the market.

Market Slots - 10,000g - Level 5
3 more slots to use to sell things in the market.

Luna Sale - 15,000 - Level 7
You can choose to list items for Luna (Click the gold button beside the amount you input to swap it to luna)

Take Offers - 20,000 - Level 10
You can choose to allow people to make offers on your items. (Essentially trades.)

Market Slots - 10,000g - Level 12
3 more slots to use to sell things in the market.

Market Slots - 10,000g - Level 14
3 more slots to use to sell things in the market.

Tamer - Talk to Kit in game
Quest: 10,000g

Animal Taming - Free - Starter Skill
Allows you to feed, walk, and farm animals for materials like Eggs, Wool, and Milk.

Artist - Talk to Artie in game.
Quest: 10,000

Create Ticket - Free - Starter Skill
Allows you to create a ticket to sell your art in the market.

Art Chat - Free - Starter Skill
Allows you to easily get details from people who are buying art from you.

Create Designs - Free - Starter Skill
You can create clothing using the Item Designer.

Crafting Jobs

All Event Recipes are Simple/Basic Recipes but only last for a short period of time. Because they’re limited I’m not including them in these lists.

Farmer - Starter Job.

Basic Farming - Free - Starter Skill
Allows you to tend your farm and use basic seeds.

Simple Seeds:
Spoiler: show
Turnip
Carrot
Sunflower
Potato

Builder - Talk to Katsu in game.
Quest: 200 Maple Logs

Simple Building - Free - Starter Skill
Allows you to use ‘simple’ building recipes.

Simple Recipes:

Spoiler: show
Maple Plank
Comment Signpost
Maple Dowel
Stone Mill
Doghouse
Wooden Planter

Blacksmith - Talk to Katsu in game.
Quest: 50 Copper Ore

Simple Smelting - Free - Starter Skill
Allows you to use ‘simple’ smelting recipes.

Simple Recipes:

Spoiler: show
Copper
Fancy Park Bench
Water Pot
Gilded Street Lamp
Flower Pot
Copper Watering Can
Stone Well

Chef - Talk to Trixie In game.
Quest: 1,000g

Basic Cooking - Free - Starter Skill
Allows you to use ‘basic’ cooking recipes.

Simple Recipes:

Spoiler: show
Flour (MUST have a Mill on your land + Tamer Job)
Pet Food
Scrambled Eggs
Cocoa Powder

Tailor - Talk to Kale in game.
Quest: 2,500g, 4 Pet Food, 1 Milk

Simple Sewing - Free - Starter Skill
Allows you to use ‘simple’ tailor recipes.

Simple Recipes:
Spoiler: show
Party Dancer Ribbons
Party Dancer Net Top
Party Dancer Shorts
Party Dancer Shoes
Party Dancer Shirt

where do we get the free starter kit? :/

You start with it, like your tent and mailbox. I'll get screen shots to explain how to open them.

Do we get exp for successful sales for Merchant? Or do we get the exp from just making a listing?

The item has to sell. The exp gained seems to be a combination of a base just having something sold + the price. Selling lots of smaller things was leveling me faster then trying to sell a few bigger things. The easiest way to level is to sell event currencies I think, they're usually fast and easy sales.

Where do we find the ability 'Keen Eye'? I have the prerequisites but don't know where to get it.

To learn the ability, you need to open your jobs page and select scavenger. Click on the icon for Keen Eye and a button should show up to buy it.

For future questions like this your best bet would be to open a support ticket. It's usually a lot faster than posting questions in the forums. (To open support tickets you can select "I need help" in the drop down menu next to your name)

Thanks! I will do that. :)