There are 3 main ways T1s control their blood sugars
1) 2 injections of long and short acting insulin, fixed meal times and fixed carbohydrate amounts. This has been mostly phased out but most of us older T1s started out like that in childhood.
2) Basal/bolus regime. One (sometimes two) injections of basal insulin which keeps your body going during the night and when you're not eating, plus individual injections of short acting bolus before each meal/snack. This has the advantage that if you know how to count carbohydrates you can adjust meal times and insulin amounts to match.
3) Hard core pumpers who have an insulin pump permanently attached which continuously supplies the right amount of insulin. Theoretically gives the best control, but you either need a continuous glucose monitor or a lot of blood tests to make it work, and of course you've got a needle permanently attached.
I'm guessing your clinic has sent you home with option number two and told you just to eat normally???? (I'm boggling that you've had no help on counting or amounts of carbohydrate - hopefully they've at least talked to you about hypos?)
Most of us learn to carbohydrate count fairly quickly and then adjust our insulin accordingly. There are courses you can go on to help with this. There's a lot to get your head around so don't worry if it takes a while to get the hang of it.
Good luck.