Get the blinkers and horn to work asap. I rode my bike a few times without them and had several "pucker" moments because people didn't know where I was going. Check for power at the black wire where the flasher relay is. If you've got good voltage (within ~1v of battery) then change the flasher relay. That's all mine was and it was like $3.
As for the horn; I'm quite the horny rider... I beep at everything. I don't have a 3,000lb cage around me so I'm going to do my best to let people know that I'm coming. If I see someone that's in a drive or side road, etc, I'll beep at least three short beeps at them. The number 1 statement heard from car/motorcycle crashes is "I didn't see him". I don't care if they get annoyed... If they're cursing at me they know I'm there...
As for the carbs, if the bike stumbles when warmed up I would fix them now. If it runs ok then you can wait. Accidents are a culmination of several innocent forces, kinda like a perfect storm. You want to eliminate as many as you can. Hence fixing the blinkers, horn and making sure the bike runs ok.
Good luck and have fun. My CB is my first street bike and my first bike in 20 years and I'm totally hooked.
Oh two other things.
1. Spend some time riding in circles and figure eights in a parking lot as slow as you can, the 750's are top heavy so you want to get used to it.
2. Remember to cross steer. To turn, press the handle bar in the direction of the turn. If you want to go to the left, press on the left side of the bars. The bike will instantly start to lean and turn left. You can then "catch" the lean at any angle you want. It's night and day vs trying to throw your weight around to get the bike to lean. Again, start in a parking lot or an area away from other traffic and try it out. Start at slow speeds, like 10-20mph and you can increase once you get comfortable. With a top heavy 500lb bike it's the only way to flick it around...