You should chew on both sides of the mouth to keep even pressure on the denture. Avoid foods that are extremely sticky or hard. You may want to avoid chewing gum while you adjust to the denture. Partial dentures are generally easy to wear and easy to get used to. Full dentures are not, especially full lower dentures.
Dental implants can improve the wearability of lower dentures.
Both full and partial dentures require time for you to adapt. Often several adjustment are required to get the fit exactly right. Please do not try and tough it out. Call and come in for included adjustments to the denture. Over time, additional adjustments of the denture may be necessary.