There’s some things you need to consider after you’ve booked a hire van online.

First if you’re booking online, make sure to check the confirmation email you receive is for the day and price you want. If you’ve made a mistake most hire companies will alter your booking free of charge if you notify them in advance.
Take all the documents you’ll need along with you when you go to collect your hire van, such as confirmation email. Drivers licence (photo & paper counterpart), Credit card you used for the booking, any additional documentation required (checked your rental conditions).
Make sure you’ve booked the right type of van hire, there’s no point hiring a combo van if you’re moving a paino, but likewise no point hiring a Luton van to move a washing machine particularly if you are only used to driving small cars.

Follow the above advice and hopefully your rental will be helpful and problem free.