Many Alliances are merely groups of players huddling together hoping they will have some measure of protection. Along comes a strong player and picks off the members one by one while everyone else is praying that the current victim will defeat them or at least hold them up. This is a typical alliance and ultimately resulting from poor leadership.
To create a truly great alliance you need to get members involved, talking to one another and ready to defend and help their allies. This is your job as the alliance leader, should this sound like to much effort you should join an alliance instead, there is nothing wrong with being a member instead of the leader, I myself generally prefer to follow than lead as it does indeed take too much time.
Should you wish to create your own alliance there are a few ways to get your alliance members involved,
1. Construct your own alliance forum either with the in game one provided to alliances or an off site one like this.
2. Involve your members in decisions from small ones like alliance motto to large ones like should we go to war.
3. Try to structure your alliance with squads and ranks giving members something to aspire to.
4. Lead by example, eg. should members see you helping smaller members they themselves may wish to do so as they grow and have the capacity.
5. Get members involved while still new to Draco, a member which has been helped, shown respect, and been involved with an alliance from their first beginnings can become the most fiercely loyal.
There are of course many other ways however these are the ones I myself have done or seen done and been successful. I will also go into further detail for each of these when time permits.