Actually, based on the info you've given us, abit hard to recommend. Have u heard of the term pre-styling yet? Something to explore
Personally I find pre styling to be the most important step for me, in which the post styling / finishing products (the ones you're looking at) tend to work best only after I've pre-styled my hair. A good pre-styler to look at? Sea salt spray. This is something you can ask leejhong and gaoxing84 about. Absorbs moisture and oil that otherwise weighs the hair down, and gives a heck lot of volume with decent hold. Game changer for me, really.
To answer your question about post styling / finishing products - like what gaoxing84 said, different people will recommend different things. You really have to start by exploring and narrowing down on what properties of the finishing product you want. Shine vs Matte, Medium Hold vs Strong Hold (Not all strong hold products work well all the time. Depends on your hair type and texture too) There really is a lot more to the hair game than a simple one-magic-product-fits-all that people tend to misunderstand about. Gaoxing84 bro will vouch for that, haha. Take the time to explore, read posts and reviews so you can find out roughly what you want out of a product, before deciding to buy any.