Fast charge for iPhone SE so, its not the watts itd the ahmp I should look out for? 1 A yes 2 A no??

The SE second edition does not support fast charging. You can charge it with a 5 watt or 12 watt (e.g. iPad) power source (the 12 watt will be slightly faster) or a 7.5 watt Qi wireless charger. You can use a higher capacity power source, but it will be no faster than a 12 watt.

You can use any power source at all, any wattage. The phone only takes what it needs, and the power source doesn’t affect battery life at all. So if you have a 91 watt MacBook power source you could use that.