Welcome to the forum
@Chrisss14
Sorry to hear about your diagnosis, but pleased that you have found us.
I have learnt most of the practical tips about managing my Diabetes from others on here.
It is a shock at whatever age you are diagnosed and there is lot to learn very quickly.
However it is a manageable condition and does not need to stop you doing anything.
At the start they will often put you on fixed doses of a background insulin (which will deal with the glucose dropped out by your liver to keep you ticking over) and also the quick acting insulin which will deal with the glucose from the carbohydrates you eat. In the early stages you may have some Beta cells surviving for a while which will continue to make some insulin, so things are not always predictable.
Once things settle you will need to start to be aware of the amount of carbohydrates you are eating and the amount of insulin you need. All carbs you eat will get converted to glucose once inside you, and you then need insulin to match this.
A book I found very useful at the start was Type1 Diabetes in Children Adolescents and Young Adults by Ragnar Hanas. Ignore the age reference (I was 53 at diagnosis) T1 is T1. It is full of practical advice for different situations and is regularly updated with the latest tech.
Keep in touch and fire away with any questions that you have. No one minds and nothing is considered silly on here.