Thanks for your reply
On every machine the instructions are with photos it is easy to use the machines .
The difficult side is to choose the right machine for my body values.
In any gym you will find machines for the two main kinds of exercise, strength training (also called resistance training) and aerobic exercise (for heart and lungs). Both are IMO vital. I like to do weight training and aerobic on alternate days, but some people prefer to do some of both each time they visit the gym. Stretching is also important, but that can be done without machines. Aerobic machines include the treadmill, various kinds of bikes, cross trainers (where you use your arms as well as your legs) and rowing machines. IMO although HIT training is great, beginners will do better to start with some steady aerobic exercise on whatever machine appeals to them.
For resistance training, you could list the various parts of your body and then try to do at least one exercise for each. So, for upper back you could do lat pulldowns and/or assisted pullups. For chest, lying chest presses on the Smith machine and maybe half or full pushups on the mat. For shoulders, dumbell over-head presses. You will also need to strengthen your core / abs, glutes (backside), quads (thighs), hamstrings (back of thighs) and calves. This is adding up to quite a lot of exercises, so some people like to split their body into sections and eg work mainly their legs one day, their upper body another. The important thing is to work your body in a balanced way, at least over the week. You don't want to fall into the trap of working eg your chest too much and your back not enough.
Normally when someone joins a gym there is a free induction to explain how to use the machines. Indeed in some gyms you are not allowed to train until you have had this explanation. I would ask for that before you pay for any training sessions.
Do the instructions on the machines show which body part that machine exercises? How many days a week are you going to the gym? IMO going regularly to the gym is a great choice and will give you great opportunities to strengthen your body and improve your health. Congratulations!