Some help with Astral for an inexperienced GM? Options

[Lord Ben]

I've run SR a few times in 3rd and 4th. Always had fun and I think the players did too but most of the time it's essentially been Sopranos with metahumans rather than a magic filled world, etc. I haven't had much experience running with any mages or anything that uses astral space, etc.

I'd like some intro DM tips and tricks to dealing with it in a fun manner. I don't want to just flat out block it from being useful but I also feel like I don't really know what's going on. It always seems "cheap" to me to have guard hell hounds and such guarding areas or mage bodyguards working the door which seems to make spying, etc far too easy.

If the mission is to stake out an abandoned biological research facility (toxic spills, mutant plague humans, etc but also mundane squatters maybe or a bunch of urban explorers) and find out who or what has been breaking in then what type of security measures would "realistically" be in place?

Is there any good articles written about the topic I can read?