Hi farkas
build a passive mult 1st - should be cheap and very easy
get a kit for the befaco module - not just panel and pcb - follow the order in the building instructions and you should be ok!
AISynthesis has a lot of beginner material - videos and kit lists - watch these
if you haven't bought a soldering iron yet - seriously consider the hakko fx888 - https://www.hakko.co.uk/product/fx-888d-digital-soldering-station-blue-yellow/ (it's the one I have)
it may be the only soldering iron you ever buy - and has a good variety of tips available in case you need to do smd in the future
other than that get:
solder with lead (pb) in it - it's easier to use as it flows at a lower temperature than lead free and isn't a problem for the small amount of solder that you will probably be doing - and won't cause problems as you won't be selling modules you build for a while at least - buy the thickness that AI recommends - buy a decent amount
desoldering braid - you will make mistakes and once you get the hang of it works really well - better than solder suckers imo
a basic multimeter
side cutters - for trimming leads
a magnifying glass on a stand (maybe a 3rd hand one)
hope this helps
Jim
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities