What's the best coffee for a beginner to try?

A nice French roast is very light and sweet. You may then find you want a Mexican espresso for the ability to see through time and commune with your ancestors.

McDonald's McCafe

Instant latte that you can make at home, or lattes from the coffee shops, you could try stronger ones as you go.

'Mellow birds' is a light one to start with at home too [an instant coffee].

With a lot of sweet creamer inside. I'd say hazelnut.

My first "coffee" was a French Vanilla. Kind of like a step up from hot chocolate. Give that a try :-)

Beginners at what?

I think what matters most is to have WEAK coffee. Pour a bit out of the cup and add some hot/boiled water to top up the cup. And add a tsp of sugar.

Over time gradually make your coffee stronger.

Cheap gas station coffee, Starbucks has so much caffeine it will make you anxious and feel dizzy

I cheat.  A lot.

We have a Keurig Coffee Maker -- I like to try a lot of new coffees.

If you can find a store that has a Keurig Coffee Maker for customers you can try a lot of different coffees.

Ask if you have friends with a Keurig Coffee Maker, talk to visit,

You might enjoy a flavored coffee such as hazelnut or French vanilla.