Simplesimon, if you're still around the Magpie magazine also published (updated) it's own clue guide for setters recently, can be found here:
https://www.piemag.com/submissions/
There's also an EV one (they're all quite similar, as someone mentioned the community is relatively overlapping and quite incestuous) which I could send to an email address if you're interested.
In terms of aspirations for getting something published, some sound advice I received on the matter was to try and reach out to the Magpie or (particularly in current circumstances) the EV. In terms of potential turnover, the Magpie publishes five barred puzzles a month, while the EV has just had a bit of a reset in its backlog due to the potential discontinuation and are absolutely crying out for puzzle submissions at the minute.
I'm mostly at the same stage as you (have just sent off my first attempt at a creation for assessment) and won't be the best/most rigorous test solver, but if you'd like someone to bounce ideas off I'd be happy to have someone to do the same with.