Pick a time of day
When you won't be distracted e.g. after you clean your teeth in the morning or before bed, and try to stick to it. Routine creates habit and changes only deepen with repetition over time.
Set a timer
Start small - 5 minutes at first, then slowly increasing in 5 minute intervals week by week. There's no need to rush! In meditation there is no goal, it is all about the journey.
Find your focus
Choose an anchor point for your meditation, such as the breath, and try to stay focused on it. When your mind wanders (and it will), gently bring it back to your anchor without judgment. Your goal isn’t to stop thinking entirely but to notice the thoughts without attaching to them, just like watching clouds pass by in the sky. With practice and patience, this will get easier.