Semi-Professional Magic as in stage performances? or paid walk arounds? If you're doing stage magic, I can be of zero assistance. In your face close up is my thing.
For close up with cards, it's nice to start with something quick and visual. If you want to run through an ambitious card routine that's fine, but I recommend that you start with something a little more eye popping that just "it goes in the middle, I snap, and LOOK! it's on top!"
I like to start off an ACR with "Pick a card", then I tell a quick story about bent cards and gamblers, their card goes in the middle, and then by magic of the Braue pop-up move, their card visibly jumps to the top. This catches their attention because they saw it happen. From there depending on the venue and audience, I will cater the rest of the performance accordingly.
Ex.
If I'm in a club and loud music is playing, I will go for things that don't require a lot of patter. If it's quiet enough for patter, and the audience is engaged enough, I'll spring for some harder hitting effects like 2-Card monte or stigmata.
The most important thing about a routine is to establish a flow. If you just stand there and do some tricks, it's great, but you'll often get caught up trying to think of what to do next. If you plan accordingly, the audience has a theme or at least some sort of concentration throughout it that will follow through with them.
After a few simple things, I like to engage a few audience members in an "experiment of imagination". They pick a card, return it anywhere in the deck. Then after some babble about how if you imagine something hard enough it can actually come true. I mimic pulling their card from the pack, showing it to them, and asking them to really imagine that they can see their card, then putting it back in face up. Then when I spread the cards with their card face up, it's a pretty hard hitting moment. More importantly, when I do stigmata later, and ask them to "Imagine their card on a big white movie screen", the verbal anchoring takes hold and it really ties everything up in a neat little bow.