Advice for my first build...

So, I've got myself the frame and forks (see attached) and nowt else. Want to do it up nicely but shamefully don't know where to start. Should probably post this in Current Projects but trust you Brighton types more...

Things that may help:
• Looking to keep it low-key and classy (brown leather seat/grips, quill stem, flat handlebars, sticker-free rims etc)
• Will be riding fixed with front brake
• Expect to use it mostly for commuting but will also hopefully get out for a few longer rides. Have a good hill on my ride home (Bear Road) but was riding 48/16 previously and getting on okay(!) with the hill
• Budgeting ~£200 (will probably repaint it later on top)
• 120mm wide dropouts
• Bottom bracket BST-threaded

Happy to spend countless hours trawling LFGSS for parts but not entirely sure what I'm looking for and don't wanna get ripped off.

So, suggestions?

You've already got some good advice.

Aim for some classic box section rims (no deep v type rims) to keep it looking classic. Mavic Open Sport etc. Laced to generic track hubs is most likely and a great start. Search on here/ebay for cheapest deals. I've sold a pair for <£50 before.

Mostly likely your chainline with standard hubs will be 42mm. Look this up online if you don't know what it means. So next your BB, chainset combo will need to fit this. Most cheap track chainsets will fit this mould with a 103mm BB. Or road cranks with the chainring in the inner ring position work great.

Then the contact points (saddle, bar/stem combo, pedals etc) should just turn up on here regularly. I have a few bits that I could sell you if you're itching to get started.

This has all been written down hundreds of times on here, but I hope it helps.