Noob here so I apologize in advance for lots of stupid questions. I have 700x23 tires and I plan on commuting so I want to get bigger tires that are big enough to withstand the day to day abuse...but also small enough for speed and weight. I was thinking about doing 700x28's but I'm not sure they'll even fit? Is there a basic or proper way to check clearances? Where would I measure to make sure?

Also does anyone have tire recommendations? I see a Continental Gatorskin's are popular so was considering those. Anything else I should look into?