Well I'm not sure what build you found, but the main skill your using is lightning strike and it's just one of those inferior skills in the game right now, nobody really uses it tbh. I'm not really current on the powerful melee skills, but I'm pretty sure cyclone is the most OP if you're looking for a good melee skill. I'm sure you won't have a hard time finding a build for it either since almost everyone has a cyclone character. Ground slam has always been a newb friendly skill to use for your first character, not sure how it stacks up currently though. Maybe someone who plays melee could help out more then I can.
Looking at your gear I think you had maybe 2 pieces with +maximum life, and that's a big no no. You need to have almost every piece of armor with +maximum life (if you are a life based character) and at the very least 2 decent +resists to elements (your resists need to be capped at 75 from about cruel onward) per armor. If you don't know yet, the main hub for trading in this game is a website called
poe.trade. You can search for items based on their mods within the league you are playing in. You can get some good upgrades for pretty cheap since your gear right now isn't the greatest. The main currency used is Chaos Orbs, so you will see everything listed in this currency. If you leave the trade channel open (in game) you can kind of see what the exchange rates for all currency is going for, but be aware their are a lot of scammers, so it's not really set in stone, just kind of a way to get an idea. Usually 1 chaos = 2 alchemy orbs = 2 fusing. I think those three will be the main currency you will see. If you're in the guild you can always just ask if you need to know what something is worth and someone should be able to help out.
Here is one of the programs used to list your items on Poe.trade. Here's basically what you have to do to open up your own shop. Go to the PoE main forum, and under "Trading" there will be a section in either Standard league, or hardcore league called "Shop". You make a thread with a title like "Bob's Hardcore Talisman Shop". When you make the thread the URL address will have a unique ID listed at the end of the link. You copy that ID, open up this Procurement program (which uses your PoE username and password to log into your account to look at your stash tabs and items) and set up your shop. The program will basically mimic your in game stash and you can list items for certain currency amounts, and then it will update your forum thread, thus also updating poe.trade so people can see what you are selling. It's a bit convoluted, but it's essential for playing this game. Here's the link to the program:
Procurement
Also while I'm rambling on, here is a website I use to check what items can roll what mods and what the different tiers of mod rolls are:
PoE mods
Hopefully some of this helps a bit. As a new player you're going to screw up A LOT. It's just a part of the learning process for this game. You'll figure it all out eventually and it's pretty satisfying. This game has a lot of depth to it that other games just can't compare with. Have any other questions feel free to ask here or in guild chat, everyone is very helpful.