Help me to get a gym routine. I need start from scratch now

Help me to get a gym routine.

Hey I'm a 30 year old obese and out of shape fellow having all the diseases relating to obesity.

For the last 3-4 years I've tried different techniques like cardio, gym, diet etc. to overcome this challenge.

But I couldn't

I've tried hitting the gym and starting a diet several times but no considerable changes are seen.... why is it so?

I couldn't even consistently stick to it.

Like sometimes a friend's or relative's marriage might pop up or a work with a hectic deadline might show up and I have to stop it

alenkil oru pani vannu 1 werk pokum.

So basically what are the ways you can suggest to get into a shape by consistently following a routine for gym and diet