Greetings and welcome to PanO family.
Elites are a bit different in Infinity. In 300 points you'll typically have few elites supported by few specialists and light infantry. It's possible to build around centerpiece model such as
TAG and specialists or run more elite-centric infantry, as long you keep scenario and order management in mind you'll be fine.
Military Order is a fantastic way to get into the game. It has just about every rule you need to master without getting overwhelmed. The continuous collection will very likely resolve around Knights with Order Sargent to support them. Reverse is possible but you get a problem on higher points. There is no model for Serpah, he's defenitly going to be released in the future.
Shock Army is decent. I'm not a fan of Knight of Montesa because he's quite specific and requires tinkering with few other elements. He's not bad just awkward to handle at first. The continuous collection will revolve around Guarda
de Assalto or a
TAG such as Dragoe or Toni. Toni doesn't have a model, planned for the future.
Military Order starter:
Panoceania - Military Order | 6 models ________________________________________________________ 
Teutonic Knight
Lieutenant (42|1)

Magister Knight
DA CCW (27|0)

Order Sergeant
Combi (13|0)

Order Sergeant
Combi (13|0)

Order Sergeant
Combi (13|0)

Order Sergeant
TO Sniper (39|1.5)
________________________________________________________ 147/150 points | 2.5/3 swc open with Aleph Toolbox

:
direct link An example of few Knights and Order Sargent support:
Panoceania - Military Order | 10 models ________________________________________________________ 
Knight of the Holy Sepulchre
Spitfire Lt (58|2)

Teutonic Knight
Combi (42|0)

Santiago
Combi (44|0)

Brethren
HMG (35|1.5)

Order Sergeant
TO Sniper (39|1.5)

Order Sergeant
Combi (13|0)

Order Sergeant
Combi (13|0)

Order Sergeant
Combi (13|0)

Order Sergeant
Spitfire (20|1)

Trauma-Doc
Doctor (14|0)

Palbot
(3|0)

Palbot
(3|0)
________________________________________________________ 297/300 points | 6/6 swc open with Aleph Toolbox

:
direct link Shock Army starter box:
Panoceania - Shock Army of Acontecimento | 6 models ________________________________________________________ 
Acontecimento
Lieutenant (10|0)

Acontecimento
Grenadier (15|1)

Acontecimento
Combi (10|0)

Bagh-Mari
Combi (22|0)

Akal
BS (23|0)

Knight of Montesa
Grenadier (51|1.5)
________________________________________________________ 131/150 points | 2.5/3 swc open with Aleph Toolbox

:
direct link Shock Army build around Dragoe and Regular.
Panoceania - Shock Army of Acontecimento | 10 models ________________________________________________________ 
Acontecimento
Lieutenant (10|0)

Acontecimento
Sniper (27|1.5)

Acontecimento
Spitfire (17|1)

Acontecimento
Combi (10|0)

Acontecimento
Paramedic (14|0)

Singh
(37|0)

Naga
Hacker (37|0.5)

Naga
Combi (26|0)

Sierra Dronbot
HMG (28|1)

Dragao
(94|2)
________________________________________________________ 300/300 points | 6/6 swc open with Aleph Toolbox

:
direct link Shock Army build around Guarda
de Assalto and Naga support.
SWC can be tweaked around. The most problematic will be specialists for ITS games, since PanO is in awkward place.
Panoceania - Shock Army of Acontecimento | 10 models ________________________________________________________ 
Guarda
de Assalto
MULTI (51|0.5)

Auxbot GdA

Guarda
de Assalto
MULTI (51|0.5)

Auxbot GdA

Guarda
de Assalto
Spitfire (50|2)

Auxbot GdA

Naga
Minelayer (27|0.5)

Naga
Hacker (37|0.5)

Singh
(37|0)

Acontecimento
Lieutenant (10|0)

Acontecimento
Combi (10|0)

Acontecimento
Combi (10|0)

Trauma-Doc
Doctor (14|0)

Palbot
(3|0)
________________________________________________________ 300/300 points | 4/6 swc open with Aleph Toolbox

:
direct link