Following up on applications

Hey guys, first time poster here wondering if someone could help me out… I’m twenty four, I live in Arkansas, and am seeking employment with an inland company to start out. I have experience in the construction field. I have only an O.S document, and don’t have the means to take a BST course at this time. I’ve sent in some online applications and was wondering if following up was worth the effort. If so, what would be the best way to do so, phone/email? Also, what would increase my chances of getting hired within an inland company? Do people tend to hire more frequently in the Spring/Summer months? Any help would be appreciated. And yes I’ve used the search function without much luck regarding Inland companies.