I make homebrew cider this way.
Apple juice (4l or so if you have 5l demijohns). It’s pasteurised so no need to boil. Make sure there are no preservatives in it.
No need for extra sugar, it’ll get to about 5% on its own.
Champagne yeast is a fairly foolproof option, it’ll make a very dry cider. You can also add yeast nutrients but TBH it should be fine without.
Add a couple of tea bags to the mix. (The tannins in cider apples are what stops cider tasting like alcoholic apple juice).
The demijohn needs to be CLEAN. If you don’t have starsan homebrew sanitizer then just do it with bleach and rinse thoroughly, the only difference is starsan is tasteless.
Cover the top of the demijohn with tinfoil and hold in place with and elastic band, it does just as good a job as an airlock.
If it doesn’t start fermenting fairly quickly in 12-48h there should be lots of bubbles rising, it’ll ferment quickly so may well be done in 72-96h. If not add more yeast and check there weren’t preservatives in the juice.
Make a few batches and chuck some other fruits in with it (boil them in the microwave to mulch them and kill off any bacteria). It’ll ferment out and leave the resulting drink much dryer / more sour / grownup than the fruity stuff you get in the pub. Or to make life easier, have a look in a polish supermarket for those fruit syrup / cordials.
My favourite was a batch I made on the yeast cake from an elderflower champagne, it gave it a lovely refreshing hint. You could probably do the same with some cordial too.
Bottle it in 2l pop bottles with a heaped teaspoon of sugar per 500ml to carbonate.