I used to be an illustrator and artist, long ago.
I'd suggest getting some cheap materials to get you going and give you the motivation to start. An A3 drawing pad and some good quality pencils of different hardness. Then pick a room with good natural light and set aside a space on a desk or something. It might help to place a board at a slight angle to put the pad on.
Now pick some basic items to draw still life. Whatever you have around. Books, fruit, a cup, anything. Start small with one item, place it in a well lit area and just draw what you see.
At this stage it's not about producing artwork, it's about learning how to represent form, light and shade. Each drawing you produce on a new page is like a lesson in observation and interpretation that can help you go on to produce illustrations you are happy with. It's also an enjoyable process: observing the little things we take for granted can be very relaxing and grounding.
As you get towards the end of the pad, you will probably naturally be drawing more complex items or groups of items.
This is a basic foundation in artwork, drawing, illustration. It can lead to other media, like painting or digital media and graphic design, photography or web design, depending where you interests and abilities lead you. Or you may just continue drawing, maybe using pastels or charcoal.
It is, however, all about the process of observation, understanding and learning the craft of expressing that in artwork. Without the basic principles of form, light and shade, any more complex stuff may be problematic.