Don't listen to Veggie, there is a tutorial. It teaches you the basics of moving in the tactical map... Which is... You know, pretty standard RTS fair, you know, Right-Click to move/attack.... Wait, that's it.
As for the base part... Once again, dead simple to understand, perhaps if you've never ever played RTS's before you'd get confused, but it's not that hard at all. You put Researchers (Green Stat) into Labs and such, Technicans into Workshops and such, while using your Soldiers and Soldier + Tech/Research to fight.
If you've ever played UFO/XCOM/XCOM:EU you're going to understand the entire thing from the get go. You set research, you set production, you then let time run. You then defend your territories (many of which hold resources, which, once again, is so simple, each node = 1 resource, so if you have 2 Metal Mines, you can build anything that requires 2 Metal Mines as many times as you want) and attack others. At which point you go into the combat mode. While it isn't turn based, you can pause the game to issue orders, similar to other games like Dragon Age: Origin. You then gather loot, which opens up more research options.
Your NPC's all level up, Techs and Researches included. This is done by Soldiers via fighting battles, while for Tech + Researchers it is done by researching and producing/building. Every time a Soldier levels up, he gets a point to put into attributes, like Strength and Willpower (there are several) these stats in turn affect skills, like Aiming, Snap Shots, Manipulation, Charisma. Each attribute, when clicked, tells you want it improves and each skill tells you want it does. You also get Training Points to spend on various abilities, such as being able to Equip Heavy gear. As for non-combat NPC's, you can train them with Training Points too, these points go into things which help them speed up or improve various other things. Such as Research Speed or Production Speed.
Hybrid's are interesting, such as Soldier + Researcher, as while they are not as dedicated as others, you often need Researchers/Techs to go with you on combat missions in order to get various things. Which of course give benifits. Not to mention, you're not only getting human NPC's, but Alien's too, which have their own Training Point abilities.
The Conquest Map is pretty simple. You click areas to capture, then build stuff, which is all done automatically once ordered. If you get attacked, you're warned and a Red mark appears so you can click it and enter a fight to free it. If you expand far enough, you'll bounce into other races borders, at which point, you'll be able to invade their area and get their resources and such.
Overall, it's a DIRT CHEAP game which has lots going for it. Combat is decent, lots to research and upgrade, specific NPC's talk and argue with each other over stuff to do. It's enjoyable for the price and I recommend it to anybody who likes XCOM:EU/XCOM/UFO series, or perhaps Xenonauts. For £5.50, it isn't bad at all.
I also believe there were two prequels to this, UFO: Aftermath and UFO: Aftershock, both set in the same universe at different points in time.
Aftermath is fighting the Aliens
Aftershock is the rebellion
Afterlight is truce and leaving for Mars
I think. Can't remeber this late.