Watch a few youtube videos to decide if you want a frontal, closure, or leave out. As for affordable hair, I've gotten some really good hair from Amazon. This hair has been consistent in quality for me for 2 years and the prices are good. They also have a body wave which I liked. Tbh its really hard to find a good frontal on there but this frontal was the only good one I've purchased from there.
I'm not familiar with closures but this one has a good number of positive reviews.
I would only recommend leave out if you get hair close to you real texture/pattern or if you're down to style your leave out every day