I'd recommend looking up the common meds on your unit in your drug manual from nursing school if you still have it. The manual will clearly identify any special preparations (dilution, roll instead of shake, etc.) and the rate of administration. Sometimes, in addition to rate of administration, it'll list a rationale, like may cause hypotension, arrhythmias, etc. of administered too fast. Others specify instructions like "do not exceed 5 mg per minute" instead if a time frame. Like others said, Micromedex could offer you the same if you don't still have your drug manual.
It's nice if the previous poster's hospital offers guidance on medication prep and administration in the MAR, but this is not routine. Neither of those factors is a required component of the physician's order. It's also not pharmacy's responsibility to educate the nurses on administration of each med (although they're a great resource). These are nursing considerations, so they're a nurse's responsibility to find out before administering the med.
Please disregard the poster who said "you need to forget what they taught you in nursing school. This is the real world." Yes, it is... and the real human lives that are relying on you to provide evidence-based best practices to avoid harm would like you to remember what you learned in this case. Barring a code situation, rates of administration should absolutely be followed. To say that's not reasonable for a busy nurse is really just crap. Make time. It's not fair to patients to receive subpar, potentially harmful care just because their nurse is in a hurry or the unit is understaffed. Medication preparation instructions and administration rates weren't just willy nilly thrown into random pages of drug manuals to throw nurses off, and to act like that's the case by instructing someone to ignore them demonstrates a lack of knowledge, in my opinion. That's not someone I'd want caring for myself and my loved ones.
Remember, you may be a new grad, but you are already an RN and held to RN standards. That means YOU get to choose how you're going to personally do things, even if the rest of your unit doesn't follow a best practice, because you have a license and a duty to your patients. Good for you for speaking up, asking questions, and wanting to do things the right way!!