1st day of Intermittent Fasting- Need Advice

(Background.)

I am fairly fit to begin with although slightly overweight. I am a 24 year old male with a height of 6ft 3 inches and a weight of about 90 kilograms, which i know isn’t ideal. Im a cyclist who cycles 20 kilometres every day but on weekends might do a 50-100 kilometre ride, which is to say- I get at least an hour of cardio done every day with 2.5-5.5 hour cardio sessions on weekends. So my current lifestyle isn’t sedentary and I have enough stamina and fitness as of now to ride my bicycle for 150-200 kms at a stretch.

(Target) I have been eating a lot of junk food so far, fried street food, instant noodles etc. So the first step is going to be cutting out all that stuff. My target is to bring down my weight from 90 kilos to 70 kilos. So that I can be faster on the bicycle and also so that I can look and feel better.

I had one major question though. I am a huge coffee person. I drink 5-6 cups (350ml cups) of coffee per day on good days, on bad days its more. Now I take my coffee with half toned-milk, half water and no sugars. I’d like to know if I can continue to drink these coffees during fasting hours if I am doing 16:8 to begin with. The thing is that my mom and dad and I drink coffee at the same time and we all drink our coffees as such, so it’s an annoyance for me to make black coffee for myself and usual coffee for them. I’d rather quit coffee altogether if it won’t fly.

(Questions.) 1- Can I continue to drink my usual coffee during fasting hours? 2- Can anyone, who is experienced at IF give me some advice that would be helpful for a beginner looking to embrace and stick to this lifestyle? 3- Will cycling during IF cause weakness? Im more bothered about weekend rides, where I do something called Carb loading on the night before the ride. (Overeat during dinner to max out glycogen reserves so that u can ride fasted the next day morning and fuel yourself on the ride rather than riding on a heavy breakfast.)