ok so since 600cc is too much power you guys say as well. what CC should i be going for then and not go over. for a person thats about 6'2 and 270 pounds. also i read talk about cylinders, how many cylinders should i stick to then?
Displacement is only a rough indicator of power, but not the best one.
There are a lot of other factors which determines how much power an engine makes, like compression ratio, and whether it's air-cooled/liquid-cooled, two-stroke vs four-stroke. These are some examples of motorcycle engines all made by Suzuki:
An SV650 has a 650cc engine that makes about 70hp.
A Boulevard S40 with 650cc makes 30hp
A GSX-R600 with 600cc makes close to 110hp.
A GS500 with 500cc makes 50hp.
A RM250 with 250cc makes 55hp.
The numbers are all over the place. A better way to determine power is just to look up the stats.
Horsepower doesn't tell the entire story though, there are other factors like power-to-weight ratio, torque and gear ratios. These all translate into how much trouble you'll get into if you goose the throttle when something jumps out at you and surprises you, as most beginners are apt to do.
The problem with asking for advice from strangers is that nobody knows your skill level. The general consensus is to start with a lesser-powered, lighter motorcycle so you get some experience of not just of how what riding a motorcycle feels like, but also what could go wrong: like target fixation, inadvertently goosing the throttle, stabbing the brakes, not keeping the motorcycle upright enough when stopping, not looking where you put your feet, etc. Most of these things have lower (and cheaper) consequences on a beginner bike.
If you truly feel like you are more skilled than average, then start off with a bigger bike. But my opinion is that if you buy a cheap, used, small bike to begin with - maybe one that's a bit cosmetically damaged - you can sell it after one season for exactly what you paid for it, or sometimes even more. There is always a large market for used beginner bikes, they get bought and sold very quickly. And if you drop that cheap, rashed-up beginner bike during that first season, you're not paying out the wazoo to replace fairings, levers, mirrors and footpegs.
One riding season and close to zero cost to ensure you have the proper base to build your skills on is not a bad trade-off.