It's a great game but I'm kind of stuck. Any links to some tips and strategies sites?

Here are some ways to cheat, but I wouldn't get too carried away with them. Good Luck.

Infinite Items
By abusing a glitch, where random encounter areas "save" the location of dropped items, you can create infinite amounts of ammo, weapons, money or anything.

Simply drop any items you wish to be duplicated on the floor of a special encounter area, such as the Gas Station, THE FIRST TIME YOU ARRIVE. Leave the area, and return. Pick up the items that you want, leave, and when you come back: the items will still be wherever you left them. This is especially useful for the Elixir of Life that the woman at the gas station sells you.

NOTE: You can also duplicate vehicles, such as the hummer and tank using this code, if you wanted to increase your motorpool. Do not do more than one vehicle per encounter area, as the game tends to glitch.

Increased Accuracy
Before leaving to the world map, have your NPCs enter vehicles from the prone position. Reaching a random encounter will return your characters to their feet, but the crawling modifiers will remain. Repeat as desired.

The latest patch corrects these duplications: they only work for the 1.0 version.

Abusing this trick may make the game far too easy, so use it sparingly.

you could check gamefaqs.com

personally though, i don't think there's really much strategy at all in a game that supposed to be about tactics. it's all about having more firepower, and i found my so called strategy just involved keeping all my people together and ready to shoot.