You need to follow all the instructions and set up an Immutable X account and also Metamask(but since you are here in this crypto blogging site so I think you know how to work those) to get the GODS token. Also, you need to play 20 matches per week to start getting the weekly GODS reward. You can track your progress here: https://gudecks.com/ -- but to get your profile, you need to play in weekend constructed (that is happening right now as I type this post) and search your name to get your ID. After that, you can bookmark your ID and you can track your progress at any time.

As for forging, most cards aren't worth the cost because they are cheaper than the GODS you put in to forge them. DYOR before you forge. Check the price of the cards with tokentrove.com and compare the selling price of those cards to GODS. But either way, most cards below epic aren't worth it to forge. You should only be forging the highly used meta epics and also legendaries. Otherwise, just sell your GODS net you more value.

For forging, you just need 2 copies of said cards from core packs, then you can forge them into 1 meteorite tier copy of the card. As you start out, you probably won't collect profitable cards to forge. I am at level 310 and I only forged a few profitable epics and legendaries. I have abundance of rare and commons but so are everyone else, so those are pointless to forge. Again, forging isn't that profitable of an activity as of now, think of it as extra profit if you somehow open multiple copies of the same legendaries after you leveled and opened plenty of packs.