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I am not a good painter by a longshot, and I recently got some wargames factory Shock Troops.I have given them a scheme that I like, just codex grey armour washed with badab black, and bestial brown cloth with devlan mud wash.
but they still look kinda empty, and I mostly play trenche-y games that go on days (in real time!) adn wanted to add mud to the bottom of the greatcoats and boots, but most of the tutorials I have seen are for adding mudd effects to
vehicles, can anyone tell me how to do it?

I like stippling on some Graveyard Earth for mud effects. It has a nice dirty, dusty grubby look to it on buildings, troops & vehicles.

Stippling in layers really helps.

I use three different colors for different kinds of filth on my SM: bleached bone for dust, bestial brown for dried mud, and scorched brown for fresh mud. To get a good "I have been fighting in this trench for weeks without cleaning my uniform" look, you want to start off with a nice dusting of bleached bone from the bottom of the feet to perhaps a bit above mid-shin level. Stipple bestial brown over the bleached bone, but take care to leave some bleached bone showing, especially near the top (remember, you want to get a layered look!). Finally, do the same with scorched brown, except you want to focus on the boots, and you don't want to get too much above ankle level. Finish off with a heavy wash of devlan mud and (if you want) gloss varnish where the fresh mud is. Your final result should be a kind of gradient look from top to bottom, going bleached bone to bestial brown to scorched brown.

For the coat, follow the same steps, except obviously you want to focus on the bottoms. Also, feel free to splatter mud and dust and what-have-you on other parts of the model. I personally advise going overboard unless it's the intended effect, as too much weathering just makes everything look disjointed.

I'd take pictures for you, but a buddy has the camera at this point. Good luck!

EDIT: I forgot to mention that if you are going to be putting mud on other parts of the model, be sure that the locations make sense, e.g. hands, elbows and knees.

Stippling Vallejo Flat Earth really looks like dried mud.

http://www.dakkadakka.com/dakkaforum/posts/list/314300.page

Check out this guy's DKoK plog. He puts mud on everything, does it well, and gives some insight into how he does it.