Welcome Lilynana
You asked about timing of once daily insulin? Well, there are several approaches, but probably the most important factor is your own convenience - ie take it at the time when you are most likely to be free to have an inhection and least likely to forget. Many people take their long acting at bedtime, but obviously, that can vary. It does have the advantage of (usually) being at home.
If you've only just started, your diabetes advisor may want to gradually build up your dose - it's safest to start low and build up.
Food advice for people taking oral medication for diabetes, as you were, and taking just long acting insulin, is very similar - low fat, low sugar; some people prefer low carbohydrate, not just low sugar. Adjusting insulin doses to food is only really possible when using basal bolus insulin (basal = long acting; bolus = with meals)