Sure let's attack the headline, drop some names, that will get him rolling

Amman must be a fascinating place to live. Wikipedia says it's valleys and ridges. You are going to want a bike with low gears, so a 21 speed is good. 26 inches is the old mountain bike tire size which is pretty common, that's good too. But I think a lot of us here will have no idea what the bike brands are in Jordan. You could help us out if you can find a link to a website about it. I struck out. "Anchor" doesn't sound encouraging if you are going up a hill, but there was once a decent mountain bike sold in the USA called a Giant Boulder, so who knows? At 5ft11 you are going to want a large but not XL frame, which means a the frame tube that holds the seat will be 18-19" from the crank axle for a mountain bike, 58 cm for a road bike.