For forces, you can model the type/mix from real formations if you like, scaling down to fit your number of figures
Here is an example of an 1812 avant-guard formation from Graf Vitgengshteyn's 1st Separate Corps
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General Kul'nev's Avant-Guard ● general-major Yakob Petrovich Kul'nev
- 23rd Jäger regiment (1408 other ranks)
---- 1st Shef's battalion ● general-major Grigoriy Nikolaevich Frolob
---- 2nd Commander's battalion ● major Semyon Petrovich Brazhnikov
- 25th Jäger regiment (1268 other ranks)
---- 1st Shef's battalion ● colonel Stepan Vasil'evich Denis'ev
---- 2nd Commander's battalion ● major Mikhail Mikhaylovich Vetoshkin
- Grodnenskiy Hussar regiment (1044 other ranks)
---- 1st Shef's battalion ● major ?? (4 squadrons)
---- 2nd Commander's battalion ● colonel Fyodor Vasil'evich Ridiger (4 squadrons)
- Platov-4's Don Cossack regiment ● lieutenant colonel Ivan Ivanovich Platov-4 (5 hundreds, 336 other ranks)
- 1/2 of the 28th Battery Artillery company ● lieutenant colonel Nikolay Nikolaevich Antropov-1 (4x 12-lber gun, 2x 24-lber unicorn, 160 other ranks)
- 9th Light (foot) Artillery company ● lieutenant colonel Yakob Yakovlevich Sudakov (8x 6-lber gun, 4x 12-lber unicorn, 179 other ranks)
These battalion and squadron strengths are typical for the start of the campaign.
Prince Bagration and the 2nd Western Army used a rather standard mix for detachments such as a advance or rear guard : 2 or 4 Don Cossack regiments (each of 5 hundreds), 1/2 or all of a Horse Artillery company, 1 or 2 battalions of Jäger, sometimes adding 1 or 2 squadrons of Hussars and 1/2 or all of a Pioneer copmany
From the 3rd Western Army, smaller sub-unit were more varied, such as these examples from the summer of 1812
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General Khrushchov's Detachment ● general-major Ivan Alekseevich Khrushchov
- Zhitomorskiy Dragoon regiment ● shef colonel Ivan Andreevich Argamakov-2, commander lieutenat colonel Konstantin Stanislavovich Snapckiy (4 squadrons)
- Arzamasskiy Dragoon regiment ● major Ivan Osipovich Bartenev (4 squadrons)
- Chikilyov-1's Don Cossack regiment ● host starshina (major) Aleksandr Fyodorovich Chikilyov-1 (5 hundreds)
- 1st Astrakhanskiy Kalmyk Cossack regiment ● advisor major Ivan Vasil'evich Dublyanskiy-2, commander captain noyon (prince) Jamba-taysha Tundutov (5 hundreds)
This detachment went pell-mell into Poland at the start of the war, raising havoc and a good degree of panic as far west as Warsaw.
General Yaplitz's Detachment ● general-major Efim Ignat'evich Yaplitz
- 13th Jäger regiment
---- 1st Shef's battalion ● general-major prince Vasiliy Vasil'evich Vyazemskiy
---- 2nd Commander's battalion ● colonel Ivan Stepanovich Velizar'ev
- Pavlogradskiy Hussar regiment
---- 1st Shef's battalion ● major Nikolay Pavlovich Ostrogradskiy (4 squadrons)
---- 2nd Commander's battalion ● colonel prince Spiridon Eristovich Javakhishvili-2 (4 squadrons)
- Lubenskiy Hussar regiment, 2nd Commander's battalion ● colonel Yegor Fyodorovich Shtal (4 squadrons)
- Barabanshchikov-2's Don Cossack regiment ● esaul (captain) S[tepan ?] M[ikhailovich ?] Popov (5 hundreds)
- 1/2 of the 12th Horse Artillery company ● staff-captain Gustav Bogdanovich Braker (3x 6-lber gun, 3x 12-lber unicorn)
- 8th Pioneer company of the 2nd Pioneer regiment ● captain Ivan Fyodorovich Kutsevich
General Melissino's Detachment ● general-major Aleksey Petrovich Melissino
- 32nd Jäger regiment
---- 1st Shef's battalion ● general-major Vasiliy Dmitrieevich Meshcherinov
---- 2nd Commander's battalion ● [major Bil'ban ?] or [captain Andrey Grigor'evich Hepenin ?]
- Combined Grenadier regiment of the 18th Infantry Division
---- 1st Combined Grenadier battalion ● major Kapiton Kuz'mich Timashev-2 *
---- 2nd Combined Grenadier battalion ● major Pavel Ivanovich Kablukov **
- Serpukhovskiy Dragoon regiment ● shef colonel prince Ivan Semyonovich Javakhishvili-1 (4 squadrons), commander lieutenant colonel Gustav Fyodorovich Engel'gardt-3 (4 squadrons)
- (part) Lubenskiy Hussar regiment, 2nd Commander's battalion ● lieutenant colonel Rodion Ivanovich Depreradovich (3 squadrons)
* 2nd Grenadier Companies of the Vladimirskiy & Tambovskiy Infantry regiments and the 28th Jäger regiment
** 2nd Grenadier Companies of the Kostromskiy & Dneprovskiy Infantry regiments and the 32nd Jäger regiment