Congratulations on your new bubby!
Generally speaking, if you follow baby's lead then you'll be ok. The best indicator of input is output, so keep an eye on wet & dirty nappies if you've any concerns about how much she's getting.
She's still very little so frequent feeding is the norm - 3-4 hourly is actually on the low side, so don't be surprised if it picks up a bit from now. She will get faster as she gets bigger so it all gets easier with a bit of time.
Keep an eye out for engorgment and/or lumps - if she won't take care of it, express a little for comfort (not too much as you don't want to create an oversupply).

It is best to avoid dummies and bottles in the early weeks if you can as it can interfere with feeding. It can affect attachment, but also replaces sucking at the breast which may affect supply.

ETA - on 1 side or 2. It totally depends on you and your baby - ie, whatever she needs. There's no hard and fast rule that suits everyone.