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Welp, its 9 days later so idk how useful this is, but I kinda like Levi because once he's gone I can replace him with some other advisor unlike Baade, which removing him annoys the left of the party. If you want you can do Baade as well of course.
[Edit: I think Baade is good for the labor economic plan, but there is another advisor besides Levi who's good with repairing relations with the left]
Usually for a popular front I get Woytnsky (I just do the labor plan and let the communists do a no confidence motion, I can just reform the front after usually), Juhacz (to get a Weimar coalition in 1928 sometimes), and Levi for the aforementioned reason

Honestly it just seems kinda worse than the Weimar coalition which is easier to get n all, but for Roleplay its kinda fun. If you ignore the commands theyll dissolve the government but usually if I have the coalition im already in a position to win the next elections and recreate it.
Theoretically all of them are possible (But you need to do the left plan for the economy to do it), I haven't every really tried doing them however.
And yea, you need the foreign minister role and you should get a card titled something like "Foreign Affairs"

For the economy, I like to get Woytynsky as an advisor from the Labor camp, and use his option for "Addressing the economic crisis". This gives you the WTB plan which is what I find easiest to do.

The non-factional advisor Baade also can get you this plan, and he's good for doing farm runs (best paired with reforming the judiciary so they dont interrupt your agrarian plans) but thats not necessary.
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To actually implement the plan you need either the financial or economic ministries, be careful with financial because the Reichsbank chancellor will just oust him right before the crisis.
I think there's a way to stop him because if you investigate the far-right the first thing you get is about far right collusion with the reichsbank but i've never done that before my finance minister is sacked.

For Joos, I believe its to have at least friendly relations to get Joos for free (but sometimes you still have to pay), or warm relations to get him for 1 resource.

It helps to not vote against the cruiser, but make sure to not vote for to keep the KPD happy enough, 
Let the Center Party have the chancellor after the reichstag elections,
And try to improve relations at least once

They wont like you if you're using the party relations to improve relations with the KPD, so avoid doing that until after Joos.

For the KPD:
The Wirtorf Affair (Thalmann's whole scandal) is August 1928, so embed a spy in the comintern before then. 
The conference where you can get the conciliators in charge is sometime in 1930 I think, i can't remember exactly when, but it won't appear unless:
1. You have asked the soviets about the wirtorf affair
and 2. You have a strong left faction, I think you probably also need at least warm relations but im unsure.

Usually once you get Joos in power for Z, they don't get too upset at you, so just avoid building ties with the KPD until after their conference, in that time you can use Paul Levi as an advisor to grow your party's left, or embed a spy in the comintern.
Make sure to not vote against the Panzerkreuzer A, just abstaining should only cause minor issues with Z.

From what I've Found, good ways to increase approval among the communists is,
1. Embed a spy in the comintern using your foreign relations card, this lets you in on a scandal surrounding Thalmann. Prevent the Leninbund from leaking that scandal when prompted.
2. Use the foreign affairs card to build relations with the USSR for the purpose of goodwill, then ask them about the KPD affair.

By the end, if your KPD relations are good enough, you have a strong enough left faction in the SPD, and you have the scandal info, you should be able to oust Thalmanns faction and get "conciliators" in charge iirc sometime in the 30s.

Obviously do things like let the communists march freely to not antagonize.