Students visa allows part time, don’t remember the exact hours but around 18 per week I think. Employment prospects are pretty nice when going into hospitality or tourism but I’ve been out of the country for a while so I don’t know how easy it is to get a job. There’s also some work for disabled kids to be found, you could also find a role in your field if it’s a high demand field potentially. Also Icelandic in just not expected of people since it’s hard to learn so I wouldn’t worry about that.