If you want to watch the whole thing (all 940+ episodes and counting), start with the Japanese dub with English sub. Because if you start with the English dub and then have to make the switch when the English dub runs out about 130 episodes in, you'll be confused as to what sub episode to continue with, because the episode numbering is different and you'll possibly miss the long special (Episode 129) which is easily one of the most important episodes in the entire series. In addition you'll then have to slowly re-learn the names of the characters. Finally, the English dub is generally of lower quality.
Do not consult the wiki for spoilers until you're at least 240 episodes in. I guarantee you that this show will last you a long time, because even whenever you eventually catch up the series will still be airing a new episode weekly.
A lot of episodes are anime-only (non-canon) and these can be skipped. If you look online you can probably find a list of canon episodes, though some AOs are good and worth watching.
I suspect that the entirety of this show cannot be found on CrunchyRoll, so you might have to turn to some less reputable platforms to watch this. But if it is all on CrunchyRoll then in watching legally you'll be supporting the franchise and the mangaka.
This show will have a very large cast, usually based on stock characters from anime and detective fiction. But a lot of them are fleshed out as people the series goes on. Ai Haibara is a fan favorite and one of the unique highlights of this series, though other characters are very popular too. This show is WAAAAAAAY better known and beloved in Japan than it is in the West, so keep that in mind.
Since this show has been airing for 23 consecutive years, it's going to have a very large number of anime openings and endings. Most of the music in this doesn't stand out as particularly impressive, but I'd recommend listening to it as you watch anyways. You're bound to like some of it, at least, since it encompasses a diverse range of styles and composers from the 1990s to the present. The longer you watch the more nostalgic you'll feel over some of the earlier music, which is another reason to listen. You'll find that the computer-generated animation is not impressive at all, for which you might like some of the earlier (hand-drawn) episodes better.
This will constitute a very large investment of your time, but for me that was what made it so good. It took me something like a year and a half to more or less catch up, so if you really don't have that kind of time then maybe this isn't for you. For a show like this you have to slog through some boring parts and keep off your phone or anything that might distract you from the viewing experience. Give it your undivided attention while watching. Don't take this lightly, because it's a commitment unlike any other anime you've ever watched.
If you absolutely hate procedural drama then don't procede. If you might find it kind of interesting then I encouraged you to watch. Of course, it's not all procedural and a good chunk of it is character development and interactions with each other. If you're looking for typical anime slice-of-life and drama, this show will not do it as well as others might. So going into this you have to appreciate the entire package.