Let me share with you all workable solutions I've employed for two years to great success with my friends at arms.
Follow this wisdom and you will build the groundworks for victory. The wisdom comes not from me, cold hard experience has proven her value. Be wise and follow these words, so you can have fundamentals from which to work.
CHAPTER 1: THE BASICS; PHYSICAL UNITY AND STANDARD ROUTINES
The four MUSTS of your team
1. You MUST have every meeting organized face to face. If you do not do this, your group's resolve will begin to weaken. Physical prescense is the absolute ground necessity. You train together, you learn together. There can be no room for lone individuals. Your battlebudy has your back, so have his.
2. You MUST share a similar worldview and religion.
The value of religiosity speaks for itself, anyone who does not see it's value is a fool and need not be part of your efforts.
The unity of worldview again is crucial. If you do not share political principles with your team, you again shall suffer as a group through disunity and ever increasing and silently growing distrust.
3. You MUST have a clear code of conduct and honour.
Man is a fallen creature, and we all fall in our duties from time to time. When we do, it is of importance that we seek justice for our misdeeds. You must have a method of physically punishing yourself for your failures through extra excercises. Your brothers at arms must be present and witness the imbalance caused by failure now restored through just punishment. Be clear about this with your brothers from the very beginning. Behave with honour and integrity amongst eachother. This is the only way to grow. Do not cower away from your failures, because they will eventually catch up with you, and all your brothers at arms will suffer.
4. You MUST have a code of valour that you and your brothers keep to.
It follows from aforementioned points that this is required. Dedicate yourself to higher goals, ethics and examplary results. Strive for excellence in Bravery & Caution, dilligence & patience, loyalty to your brothers & devotion to your cause. Seize opportunity wherever it arises; be vigilant for the chances heaven gives you, walk not in darkness!
With these core virtues defined and ready, you can begin to establish your group.
You must organize yourselves into communities within about 20 minutes driving of eachother.
You must at least organize into groups of two, for it will greatly improve your options and chances. Without your battlebuddy you are already dead.
Then, as a group you must train twice a week:
first you train the martial arts so you and your buddy will grow strong. Be not afraid of hitting eachother, learn to get hit, learn to receive a punch.
second, you must train the practical skills of teamwork & movement, map reading, map making, navigation, and how to march in good pace through unconventional terrain while carrying your equipment.
Furher, your group must attach the acquisitions of skills to your efforts. You must do this in two layers:
1st, Give every member of the group a skill assignment to delve deeper into (Medical knowledge, survival knowledge, radio knowledge and comms, etc.)
Every so often a member must give a presentation on the subject he's studying. The mark of his mastery will be his ability to explain this subject to his brothers at arms, by this standard, judge yourself when you present a topic!
2. The entire group has a book in common related to theory to study, which will deepen the understanding of the entire group on laws of war, nature of conflicts, rules of violence, political theory, whatever may be relevant. This is crucial, you may NEVER accept stagnation in your knowledge.
Further, every single week the group must analyze the current situation of politics using the OODA-loop. This is both an excercise aswell as a vital tool to adjust the trajectory the team has embarked on in light of developments.