Is cheap web hosting fine for a small brochure site?

register the domain somewhere other than the host if you can. cheap hosts are fine right up until you want to leave, and having the domain with them makes moving a pain. also check you can download a full backup yourself, not just take their word for "we do backups".

Yes, it's plenty for a few pages. Check the renewal price before you pay for three years, it's often double or more. And make sure SSL and backups are included.