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I'd go with even less stuff to start:

Here's where I would start based on your description:
Keystep - Midi-CV

yes, but not for it's midi-> cv, but because it's got a basic cv sequencer in it... even this could be dropped and use Pams for quantized stepped random loops as a pitch and envelope 'sequencer' to start with... it's more important that you can generate some pitch & gate/envelope information than what it is at least to start with...

Clock - Pam's (for clocks and slow evolving LFO/Random)

yes - & see above! the new Pro version is probably a better buy than the older New version - consider a passive mult and an attenuator module (happy nerding 3* mia, for example) as a good way to make Pams go a bit further.. they're also good investments for the future...

Sound Source - Plaits

yes definitely a sound source, but pretty much anything will do... plaits does have the advantage of having a built in lpg (vca/filter combo) and lots of different sounds it can generate... if you do want plaits.. go for a full size clone and not a micro version... ergonomics are better and it'll be easier to tune!

Filter - to taste (Cinnamon, Ikari, Wasp, lot's of great choices)

if getting plaits... this is a nice to have, but I don't think essential, due to plaits being a voice module in a lot of ways, as well as being an oscillator... 2nd batch of modules unless you go with something other than plaits...

Sampler - BitBox Micro (also has Midi in)

could easily be in a 2nd batch... or "batch 1.5"... maybe, learn to use what you want to sample first... then add in the sampler... could be part of 1st batch, but don't start trying to patch it in before you have a grip on everything else...

External - Somethign to make connecting Mic or 1/4 instrument easy

again... maybe not in the 1st batch... something with envelope follower and gate extractor would be a good idea... befaco instrument interface (adds phantom power, xlr and quite quiet) or doepfer a-119 (noisier, but cheaper)... if you want to sample yourself playing, for instance, guitar, then think about how you are going to do play and control the sampler transports etc at the same time... there are modules to use with footswitches and expression pedals... these may be key to what you want to achieve! so you may want to get one or more of those at the same time as an external input!

Modulation - Stages/Clone for Envelopes and modulation

again maybe batch 2 - use Pams for modulation and envelopes to start with... gert this when you need more modulation...

VCA - Veils/Clone

yes... possibly one of the best investments in eurorack

FX - to taste (Morphagene and Memeophone are very good, but there are TONS of amazing FX)

not essential for learning... but probably a good idea so you can get some different sounds out of the modular from day 1.. personally I'd go for an fx aid pro, though and then add in whatever specialised effect module you want in a later batch... the fx aid pro has 200 different algorithms (covering all sorts of things including reverbs, delays, etc) and has a decent amount of modulation inputs - as well having an internal lfo... it also has a basic, if functional scope (which can be used at the same time as an effect - it uses a different input) which a lot of people seem to like as it helps them visualise waveforms - both audio and cv - and can help understanding... ears are better though... want to know what a modulation source is doing? send it to pitch input of vco and listen to it...

another great thing about the fx aid is that it also has a load of percussion algorithms... so if /when you are using a multi-channel sampler - you have those to sample and build a rhythm track from...

make sure to get the pro though... the others use LED combos to show algorithm, which needs a cheat sheet to figure out & only hold 32 algos an obviously no scope... if you get a subsequent one these are fine... as you can order the algos so the pro is the cheat sheet!

Audio Mixer - Something that interfaces with your other equipment well

you could easily use the veils clone for this to start with... just make sure to start with everything turned down...

So many modules out there it’s completely overwhelming.
-- Darclinc

yes 11k+ of modules is quite a lot... at least to start with sticking to better known/more popular brands can definitely help! and sticking to modules that are 'in production'...