Congratulations! I'm by no where near perfect but a couple of house keeping bits if you are new to a work place and an office environment
Arrive early and leave late making sure you are and underestimate your breaks. So nine to five, arrive for 8.30 coffee loo starting working 8.50, 12.35 - 13.25 for lunch and then leave at 17.10. Making sure you have written tomorrow's to do list. This means if you are looking to do Flexi time or need to leave early once you've passed your probation they'll see it as a genuine request not trying to skive.
What makes you nervous? Typing emails, meeting and greeting, excel, small talk? Practice online or with your family. General chit chat, how was the weather did you have a good evening? Goes a long way and remember if asked be positive but not too detailed. I role played meetings!
Make sure you have prepared the night before and washed and cleaned in appropriate clothing and not too much make up. Eat breakfast if your tummy grumbles. I always brought spare tights powder mints tooth picks and perfume. This helped my confidence.
Make sure to ask someone if you don't know. Be positive when asked to do something, then go away and properly scope out the task and then go to your line manager with a list of questions.
Always have questions for meetings.
Be helpful but don't offer to do stuff that stereotype you (minute taking is a helpful skill, organising birthday cards isn't).
Don't apologise, thank people for their advice.
Take notes as pp say
I am by no means a 300k mnetter but I went from a unsociable grad, to office admin assistant and I am now well (ish!) respected as a manager and sme in technical area.
Good luck and you can do this xxxx