[RPG] Does a druid starting with a bow start with no arrows

5 weapons is correct if you always choose the option with the most weapons. Though this probably isn't the best use of your initial equipment loadout.

You could list them all on your character sheet, but it might be better to note your attack bonus (your strength mod plus your proficiency bonus plus any other bonuses), and your damage modifier (your strength plus any relevant bonuses), and then either write down or remember the die that you roll depending on which weapon you're using.

This is probably easier than writing the same expression down several times with a different die in each one.

There are only limits on what kind of attack you can take with a specific weapon if specified. One such limitation is for two weapon fighting which requires light weapons.

You choose only one of the options. This isn't actually ambiguous in English—choosing from a lettered list is a convention that always means "or" except when specifically stated that more than one can be chosen.

The ses in the words like arms or defences do not indicate anything to the contrary — that's another feature of English that's potentially confusing, but also unambiguous. In English, the s can mean either a word that's grammatically plural or grammatically categorical. Categoricals are words that indicate represent kind without meaning singular or plural. You would not say “choose your defence” or “choose your arm” — at least, not without being grammatically incorrect. For those uses, the categorical must be used, and the categorical is formed the same as the plural — but does not mean plural.

So the Druid must choose either Hide Armour or a Wooden Shield but not both, and similarly for the other classes with these choices.