How many nappies will I need?

I would recommend between 10-12 to start off with. Some people manage fine with that many.  Other people like to have more.  It also depends on how often you want to wash.  I liked to have plenty so I didn't need to wash every day.  18-20 maybe a more realistic number.  Remember you don't need to buy them all at once.

Can I use them at night?

Yes you can.  For night I would recommend a combination of hemp and microfibre.

Do I have to soak them?

No you don't soak modern cloth pocket nappies so you do not have to worry about the expense of napisan.  The sun is a great way of removing stains.

Do I have to use a nappy liner?

No you don't.  The only time you need to use a nappy liner is when you are using a barrier cream.  The nappy liner will protect the nappy as barrier creams can leave a residue on the nappy.  Some people like to use nappy liners all of the time and some people don't.  Its a personal choice.

Do I need to use a cover?

No you don't need to use a cover.  The outside of the nappy is made of PUL which is a waterproof fabric so a cover is not required.