I am performing for roughly 250 people in a fairly large setting for around 20 - 30 minutes.
Okay... Do they have sound? Will you have a mic? Will they be standing or seated? If seated, at tables or in more of an auditorium style?
My act is basically written out. The tricks I plan on performing are Invisible deck, Ambitious card, pressure, other visual, flourishy tricks, and dresscode.
Okay, when you say written out, how do you mean? Do you have a script that you are rehearsing? Because just looking at that list... It's a collection of stuff that has no inherent connection or relation to anything outside of being all about playing cards up until the last possible second. I see no flow here. I see no logical progression. I don't understand how you make these transition from one to the next, how you segue.
And to fill 20 minutes, each one of these effects would have to take about 5 minutes each. Each. Can you make an ACR last 5 minutes? Because I can't. I've seen maybe two ACR performances with more than 3 phases that didn't make me want to fall asleep standing up. Don't get me wrong, the ACR is a classic for a reason. But when done poorly with too many phases and not enough showmanship, it is the pasteboard equivalent of Chinese water torture. Badly performed card magic in general will slowly erode your brain's defenses, wearing it down and numbing it until you finally can't take anymore, surrender, and find yourself saying, "I understand now. Gray's Anatomy is entertaining."
I will also talk about magic in general. My style is based around street magic, so I don't have large stage effects. I do need to expand on the list. That is why I would love recommendations.
I'm comfortable with any sort of prop that wouldn't seem too unusual in a normal street scene.
Okay, you have not listed a single book. That's not good. Street magic (as you understand it) does not transition easily to parlor settings. The leap can be made... but not without some effort.
You're going to go to the library
tomorrow and find a copy of Mark Wilson's Complete Course in Magic. You are not going to so much as glance at the card section until you have read Mark's essays in there and perused the non-card sections to get an idea of what your fundamentals should look like. You are going to select a dozen different effects using basic sleight of hand that you believe you could successfully learn through daily practice in the two-month period you have. You're going to come back here with that list next week, and we are going to help you create a routine and script that you are going to rehearse, not just practice but
rehearse, every single day, including at least once the day of your show before you leave for the venue.
Two months is not as long as you would think. It's really not. What you need more than anything is a solid foundation, a crash course in basic showmanship and theatricality, and a metric ass-ton of resolve that you are going to see this thing through to the end no matter how boring the rehearsals and practice might get.
You know what? As long as I'm thinking of it, while you're at the library, grab some fiction. Preferably something fantasy oriented. Tolkien, Burroughs, Gaiman, Pratchett, whatever. You're going to be writing your own material. You need inspiration.