If this still need to be clarified I'll try to help with the commands below.
The basic commands to claiming your base as follows.
You start a town by standing in the chunk you'd like to claim (You may click F9 to see the chunk borders)
and then with the command /t new name
"name" is a flag so for example: /t new ECorp
Would create a new town named "ECorp" (Unless the name is already taken) and it'll cost you 120 to start a town as well.
After that you may want to expand further, so you'll need to add money in your town's bank, you can do so with this command
/t bank deposit amount
"amount" is a flag so for example: /t bank deposit amount 100
Would add 100 dollars to your Town's balance. You can see your town's current balance with /t bank info
Finally you would use the command /t claim to claim the additional chunks it cost 20 dollars per chunk, you may only claim in cardinal directions (No diagonal claiming)
Additional Commands:
/t perm list
will show all the perms your town has enabled/disabled and the name of the flags
/t perm set "flag" True/False
This command will allow you to change the perms of your town to your liking such as turning mobs on/off in your claim.
/t info
Will give you info about your town such as who is a resident, and how many remaining chunks you have left to claim.
/t invite name
You can invite people to your town with this command, remember though to only invite people you trust!
/t 1
/t 2
/t 3
ect
Will give you a list of additional commands