OP, in your own words you have great boobs and lovely, shiny hair. You don't need to cover yourself in makeup if you'd rather not, and you don't need to do anything different with your hair. Long hair which is silky and in great condition looks beautiful just left down.
Clubs are usually noisy and hot and there's usually nowhere to sit down. You'll need shoes which are reasonably comfortable to stand and dance in, and won't make your feet hurt or give you blisters. No trainers or shoes that look like trainers.You don't have to wear heels. Cute ballet pumps look just as fab. Or try kitten heels, they're very comfy and give the impression of a heel but are so low that you won't feel uncomfortable. Or wedges, another good option.
If you're getting new shoes, break them in before you go or else you'll end up with blisters.
Re tops. I would say the white one with the lacy straps and maybe the blue one next to it would be fine if you pair it with some slim-leg trousers. People tend to dress up a bit for most clubs, but that doesn't mean tiny dresses necessarily. A nice pair of slim leg trousers and a short-sleeves/spaghetti strap pretty top is ideal. Don't wear jeans and don't wear trainer-type shoes. If you're getting a new top, just look for something that's a bit dressy so maybe glitter, thin straps/short sleeves/bit of cleavage showing. Ask yourself if you'd wear it round for dinner with your folks - if the answer is no, you're on the right tracks!
You don't need to go all out glam. Honestly, once you're inside, no-one will care. On the other hand, if you're wearing a long-sleeved top you'll feel hot and uncomfortable. Dress for your comfort.
Also be prepared for sensory overload. When you get there it might be an idea to try and find if there's a quiet area. Clubs are bloody loud, there's lots of people squashing around the dance floors and bars, and the lights can be overstimulating too. Clubs normally have quiet spaces where you can escape for a bit if it's overwhelming. Sometimes the toilets have a chill-out zone separate from the actual loos and sinks.
Think about coats. Are the others taking a coat and putting it in the cloakroom too - or is there door-to-door taxis being organised? It'll feel really cold outside at this time of year and when you come out of a hot club you'll be freezing unless you're stepping straight into a taxi. However, queues at cloakrooms can be long so make sure you're not the only one taking a coat because you'll feel awkward if they're all queuing just for you.
Handbag. I would rock the hell out of my Captain America handbag and not give a shit. It sounds ace. If you're not comfortable with that then go for a bag that's not too big but still has enough room to hold your purse, keys and phone easily. Look for one that's difficult to undo to give a bit of protection against pick-pockets - so think zips, compartments and poppers if possible.
I've tried to give some black and white answers here that will help. Don't worry, honestly. It will be absolutely fine. You might be surprised how much fun you have!