Welcome and I am sure you will enjoy your stay!
As @420SA mentioned, start a grow diary and if you get stuck ask for help. Killing your plants won't be nearly as easy to achieve then.
Good equipment is not cheap, but it's money well spent generally.
Good genetics also aren't cheap, but it certainly makes a difference - TH Seeds are well priced and pretty good and I see one of the Vendors on the forum @Cannabist stock them and currently have a special running too.
Worlds Strongest Strains are awesome, although regular seeds and not terrible in terms of pricing. Since you get regular seeds, you can always easily breed for more seeds if you'd like. Biltong n Budz stock WSS.