As Noblehead says, a DAFNE course will help you sort it all out. Ask your doctor/nurse for some education right at the beginning so you know how to sort it out. It is so much easier to use carb counting to work out how much insulin to have for each meal. You really only need to count the carbs: calories etc are not relevant to insulin, only to general health.
Some of the advantages of your new regime are: you can eat whenever you like; you can miss meals (but be careful and test just to make sure you are safe); you can eat more sweet things if you feel like it and inject for them, just as your body would produce its own insulin for them if it still could. (not, of course, that I'm recommending that, but... :wink: )
The drawbacks: it's a bit more of a nuisance with a couple more injections and some extra testing, especially while you are learning what does what to your blood sugars.
I went onto a basal/bolus regime about 27 years ago when I was first pregnant, so I don't know what my control was like in the 8 years before that as there was no blood testing available before then. I got some test strips with that pregnancy and never looked back. The system is so much more flexible than a fixed dose twice a day that restricts your mealtimes and amounts. I'd say, go for it. It's worth getting through the unknown bit at the beginning for the advantages of flexibility once you have learnt more about it.