I’m sure an entire book could be written about this, so many variations on a theme.
When fishing shallow, I always prefer to get the fish feeding confidently before fishing for them, this might mean feeding for 30 minutes before even attempting to catch them. F1s can be finicky. Best to wait to see swirls on top till you know they are there in numbers. Catching them will be far easier too.
KC Carpa Power 4×10 a good float for small baits. On some days caster will catch you F1s and its not always pellets that do the damage, although I would always start on the pellets.
Consider having no float on at all if you are allowed, it will outscore having a float on most of the time if its calm enough not to blow rig about. Bites will put elastic out. Fish with pole above surface, i.e. not floating.
Your experience and confidence will grow with time, its not an instant skill like some people think it is. Firing bait via catapult around pole tip whilst holding pole, preferably always shorter than where you are fishing is key too.
Can be very exciting fishing.
Good luck