Hi Elsa, welcome to the forum. It's great you have joined the forum to build up knowledge before your lovely little hamster arrives.
Maz and others here are incredibly knowledgeable so you have come to the right place.
I just wanted to mention that if money is quite tight please be aware owning a hamster is generally much more expensive that people expect. Even to prove the essentials such as a suitable enclosure, bedding, food and other enrichment is often more than you would expect. I think there is a thread on the forum somewhere where members have discussed the costs of a new set up, and offered great advice on how to try amd keep the costs down.
It's great you have joined to build up your knowledge, and I wouldn't want to put you off owning a hamster as they are lovely little things, but I wouldn't want anyone to take on the responsibility of ownership without knowing what they are in for.