Check your tire pressure EVERY time you get on the bike. Do not assume the pressure it correct.
You boutie takes a long time to get used to the saddle.
You really don’t need to worry about how many gears you have right now but be sure to always gear down to an easy gear before you stop so when you take off again you don’t fall over because the gear your in is to hard to push from a stand still. When you build a cadence you will run through more gears and it will make a difference.
Clipless pedals are the way to go
peace out
t