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If you're not going to reinstall carpet on the new floor, pull up the tackstrips by hand. They should come up relatively easily, as long as you're wearing your heavy gloves. Use the pry-bar if necessary. If you are going to reinstall carpeting, inspect the tackstrips for wear and determine whether or not they're reusable. If they're dull, loose, or otherwise worn out, consider pulling them up and replacing them anyway. It's also a good idea to keep an eye out for any extra carpet nails, screws, or tacks that might be on the floor after removing the carpet. Sweep them or gather them up by hand and throw them out. Sometimes there'll be a lot of staples, which can be a pain to remove. Use your pliers to pull them up, and make sure you get them all. Carpeting uses different types of adhesives, and some require a simple scraping while others will require a more thorough cleaning. Clean up the sub-floor as best as possible. Look for a floor cleaner that removes adhesives, if scraping doesn't the glue off like you want. You can find it in your local hardware store. It's very important, regardless of what you want to do with the room next, that you inspect the condition of the subfloor and make any repairs necessary while you've got the carpet off. It'd be a shame to install $800 worth of new carpet over a squeaky floor, or a floor showing signs of mold. Walk around the sub-floor and bounce on it. Subfloor panels should be attached to the wood joists with screws or nails, and if you find some panels that squeak, you can secure it to the joist with ring shank nails. These are grooved nails with more secure gripping power, decreasing the chances that this squeaky area will ever squeak again. About two or three inches from the previous nail or screw, hammer in a shank nail and you'll be set. If your carpeting was damaged or wet, it might have impacted the subfloor. Look for signs of rot or mold. If you see any signs of serious damage or rot, you need to have these panels replaced before installing new flooring. Once you're done making your repairs, sweep or shop-vac up the remaining debris and glue-scrapings from the job before moving forward with installation. Once you've removed old carpet, you can install new carpet, laminate, or other types of flooring.

Summary:
Remove any tackstrips that have been left on the floor. Scrape the glue off the subfloor with your prybar or knife. Check the condition of the subfloor. Vacuum up the rest of the debris.