Go to a shop, buy a valve tool and a tyre pressure gauge. 20-30 dhs. Watch some videos on YouTube to show you how to remove the valve and deflate and stick it back in again before the wheel goes flat. If your budget will stretch to it, buy a tyre inflator/compressor thing. If you can't afford a tyre inflator, buy a double barrel foot pump but be prepared to sweat. Driving on the road with deflated tyres will wreck the sidewall. Big bulges will come on the side of your tyre and it could blow out and throw you off the road.
Off road, you want around 15 psi in your tyres, maybe more maybe less but try 15 first time and see how it goes. Too high pressure and your wheels will spin, too low and your tires might pop off the rim. Pop off is a pain in the ass, especially if you have no spare, no tools, no experience and are alone. I use the petrol method to seat beads but it you don't know what you're doing, you'll end up with a burnt out car in the desert and a long walk home.
I still recommend going on one of the Carnity desert drives on a Friday for your first time. Go in with an open mind, be willing to learn and don't be cocky and you will pick the basics up quickly. I am into drifting and rally driving and I learned in no time at all because I accepted the fact I was a novice in the desert and didn't know anything but was willing to listen. @Gaurav and at @Rahimdad are pros at desert driving. They have many years below their belt doing this and didn't get to being marshals without reason so these are the guys to stick to. If you like chicken, @shadow79 will be your friend.
Please bear in mind, I am not an off road expert. I am just trying to steer you in the right direction. If you head out into the desert alone with no experience, you'll end up walking to find a signal on your phone or hoping some hospitable local will come along and rescue you.