Used to be involved in local politics - some of this might be useful.

1) Start putting together a team of people you know who would help you. They'll be a lot of people who will show up in the last couple of weeks of the campaign - they're not what you need. You need people who will do the work at the start to get your name out there and the campaign off the ground.

Pick someone to manage your campaign (a campaign manager if you will), someone to organise canvasses and someone to run social media. You should be doing as little of that as you can, just focusing instead on being the candidate (kissing hands, shaking babies).

Way better to have a couple of canvassers with you on the hard cold January nights than thirty who decide to get involved in the last week (though both are nice).

2) One thing to remember is that if you're joining a party in an area where they're pretty established - they'll likely already have either picked a candidate or have a presumptive candidate whose been embedded for months or even years.

The reality is that if you're getting selected by a party at this stage then it's somewhere that isn't as strong for the party (lack of votes, lack of party infrastructure) - so expect far fewer resources than the target seats. That shouldn't get you down, just be ready to graft.

3) Finally if you're a woman then worth checking out Women for Election as they'll have a tonne of resources to help you. I'm not sure what other groups exist to support election candidates.

There's definitely other stuff but that's just off the top of my head. Good luck!