If you are new to knives, you will receive a lot of advice, some of it may be confusing to you. Many new buyers make a mistake of buying too large a knife, or getting a fighting knife instead of one designed for outdoor uses. IE: A long, double edged dagger is clumsy to use for cleaning fish, peeling potatoes, splitting small firewood, and other general camp chores. A large Bowie knife is also clumsy for these type tasks.
Many users prefer a blade no longer than 4" to 5", with a drop point. A handle that fits your hand, will not slip when wet, and is comfortable is a good start. $30-50 should be more than adequate for a starter knife.
Other outdoorsmen may advise differently. Knives are extremely personal items, and often stay with us for years and years; some get lost quickly. Come to think of it, knives are a lot like women. (Maybe you should forget everything I advised.)