For the love of god don't wear all black.
Nice black shoes (not pointed) preferably with a satin finish or something between satin and gloss, high gloss aren't good for shoes you'll need to work in on your feet and show marks like you wouldn't believe.
Fitted pants preferably black, since you aren't very good at putting things together keep it simple, go with black pants that are fitted nicely that do no bulge or tighten in sny one spot but actually fitted.
Go for a shirt, button done, keep it simple sty away from bold lines or colours however if you find something with s bit of shine to it or a really really light pattern or texture in a simple colour go with that, medium gray works well and is simple, plus it'll pair well with the black pants anyway.
A tie will depend on the place, choose something simple again it can be something more colorful but keep it simple and clean looking and the great thing is you can add it after the fact if you get ther early and see all he people working there wearing ties, put yours on.
Mm now blazer, mmm unless its cold no. However a vest you can pull off, it'll show the shirt and a tie nicely plus can help hide a shirt that doesn't fit perfectly around the waist.
Wear a damned belt that matches the shoes but has a nice buckle, can be shiny.
Wear a watch, a nice one doesn't need to be expensive but needs to be polished silver (stainless steal) and looks clean not like it's been worn by a Plummer for the last twenty years.
Yes you could go s lot more complicated, yes, you could wear all sorts of things but the more simple you make it the cleaner you go the easier it'll be for you to make it work.