Hi Caymen,
I've been a cop 25+ years, I am also a Federal Firearms Licensed (FFL) gun dealer and a police and NRA civilian firearms instructor. All can be verified online.
I'm telling you what I tell rookie cops and civilians getting a CCW. First carry gun, go revolver. Believe me, as big and strong and brave and tough as many of my students are...when it is an "OH S**T!" situation your brain goes into overload and unless you practice and qualify regularly under induced stress combat scenarios, it will take all you've got to even remember you have a gun. Trust me, please.
Get a revolver. Simple, Works. Not complicated. No buttons or slides or safeties to mess with. Point and pull. If round one is a dud, pull again. Not affected by pocket/clothing lint, lack of attention, etc. to the same degree as a semi.
Later, go for a semi if you like. My first off duty gun was a Colt Cobra alloy revolver. Now I carry it and/or an HK P2000sk off duty...but I've been on the job a quarter century.
Also, if you are with a loved one or adult friend and you are incapacitated in a life/death situation, you can handoff the gun and anyone can fire it.
If you drop someone while CCW and you're carrying some tricked out semi with hot ammo, even in a 100% righteous self defense shooting it will come up that your gear reflected your inclination to get into a firefight, whereas a little .38 special snubbie revolver looks pretty damn innocent when presented to the jury in a wrongful death civil suit. Oh yea, my advice is ALSO to tell your insurance agent to add an umbrella policy to your homeowner's, renter's and/or auto policy. It is cheap, and I guarantee somebody will sue you if you drop someone, however justified.
My recommendation for a first gun is one of the lightweight Smith and Wesson revolvers that have a shrouded hammer or are hammerless. The lighter the gun, the more exotic the metalurgy, the more its gonna' cost. Use factory ammo, don't go +P, +P+, ++PP++, Ludicrous Load, etc. Any cop will tell you it's shot placement first, ballistics second.
Email me if you want to discuss. Holsters is a whole 'nuther discussion. I've got literally every style holster known to man. All have pros and cons, based on your needs, body shape, climate, etc.
Good luck with your lessons and purchase. Think hard about this, and if you can REALLY take a life. We all say we could drop someone who threatened us or our loved ones, but alot of times people freeze and the bad guy gets them. Train and practice practice practice.
Take care.