Welcome to Wikitree. I have found Wikitree to be personally rewarding and I've enjoyed my time on here.
Hopefully you can go through the Volunteer process, and start creating profiles for your ancestors that you personally knew. If you need a hand, contact the greeter. Most genealogy sources aren't available for a first period of time, so by getting in the details that you can to begin with, will help you get to a point where others might be able to help further. The other thing is, you will probably find, when you begin going back a few generations yourself, that you will hopefully run into work that other people have already begun.
Now, I notice that there are some Huston's from Londonderry already in Wikitree, for example
https://www.wikitree.com/wiki/huston-2041 . Hopefullythe manager of that profile might be able to offer you some assistance too. Most profile managers are happy to here from new potential cousins, so it may be an idea to send them a message too.
I hope you enjoy Wikitree as much as we do. Welcome again.