On point 2, there's quite a complex answer. Firstly, the vote was basically "Leave or Remain". Remain meant stay in the EU on the current known terms. Leave meant... well: You could leave the EU but remain a part of the single market for trade (this was promised during the referendum), you could leave but have a custom arrangement with the EU like Switzerland which means you retain EU law but have no vote (this was also promised during the referendum), or you could leave all the EU institutions and then re-enter a random assortment of them like Euratom (this was also promised during the referendum) or you could leave the EU entirely and just start negotiating some free trade agreements like the EU's relationship with Canada (this was also promised in the referendum).

The key is that because the 'Leave' campaign weren't in government and weren't one single organised group and didn't actually hold power they could promise literally anything safe in the knowledge that they'd never have to actually deliver it. In fact after 'Leave' won the referendum the Prime Minister resigned and none of the key Leave campaigners actually mounted a serious campaign to replace him- someone who campaigned for remain was put in charge almost unchallenged.

So through all this murkiness you end up with one key fact: 48% of the country wanted to remain, 52% wanted some form of leaving but each of those options I listed above probably garner no more than 20% of the vote by themselves. So we're 52:48 in favour of leaving, and 80:20 against any specific way of leaving.