I would like to form a brand new pool or design one. Would we have to group up on here? and what is a average difficulty?
You're going to need amass about 3 Peta Hashes (about the equivalent of 3000 AntMiner S5s) worth of miners to score blocks more than once a day.
No. That is only if you are solomining. If you are pool mining, you just need people with good hashrates.
Making a pool is hard. You have to attract people with great marketing scheme and features. People won't go to you if you have low hashrates, ugly and glitchy UI or frequent downtimes. You need ddos protections and various servers around the globe. You have to get big fundings to make a pool that would truly attract others. You are better off joining an existing pool. If you want to learn about Bitcoin, surf around the forums and YouTube.