Could be a while before you need to worry about them, unless you are making fast progress and have a big clan already.
To send resources you need the market, to house troops you need the war bloc. Both in the town
Sending resources is expensive, especially early on as there is a penalty tax.
The war bloc requires drafts to build/upgrade it, as well as resources.
To put things in the store you will need to collect points from clan tasks or help button.
On the town page are two symbols, which change the icons,the first icon, contains the clan icon,(right of map link) clicking on it will open the clan information page, here is where you add things to the store ,so they can be bought.
Its pretty self explanatory.
The stronghold is probably way down the list.
You need lots of resources lots of scrolls and influence to start one.
It takes 12 weeks to build without boosts.
Once built you will need more scrolls, resources, and a number of other special items to expand.