I am new to brewing and I am interested in brewing a hoppy IPA.
An IPA is, by definition, hoppy.
I have two brews under my belt that turned out well.
Excellent!
I really want to experiment with dry hopping. I am not sure if I should just buy a normal kit and make modifications like using citra hops/buy more hops for dry hopping?
There are kits that include the hops for dry hopping. This is not an endorsement but an example:
https://www.northernbrewer.com/documentation/beerkits/QueenofAfricaIPA.pdf
This is Northern Brewer's Queen of Africa IPA extract kit instructions. You'll note that they include hops for dry hopping, so right off the bat that's what you have, a dry-hopped beer with a recipe that is proven. You could, of course, add more hops during dry hopping, but then, as I note, if it doesn't taste good then was it your tweaks to the recipe, or something you did in process?
There are many other IPA kits out there like this one; I only note it because NB is good at providing both the recipe and process instructions to look at prior to purchase. I'm not endorsing this nor not endorsing it, as I'm generally not a hop head--I tend to prefer maltier offerings. I can enjoy the occasional hoppy beer if it's not overly focused on bitterness instead of hop flavor and aroma.
Or waiting to add LME/DMEuntil after the boil? I am looking for something easy to drink. Any tips or suggestions would be appreciated.
Waiting to add it after boil? Why? What would that do? If you're buying a kit, you should follow the instructions and timing the kit gives you as they are necessary to produce what the recipe is intended to produce. You can tweak that, but don't just make changes without knowing for sure what that will accomplish.
I know the temptation is high to make our own recipes, but IMO new brewers should work on honing their process. If you have a reasonable recipe, everything else is process. That's the beauty of kits, esp. for new brewers: they don't need to make decisions on recipe, they can just deal with the process. When you're really new, the process is almost certainly still in flux; changing around recipes at that stage means if something doesn't work, was it the recipe change you did, or the process that produced the outcome?
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Now, the beauty of all this is you don't have to take anyone's advice on anything here--you get to decide. For you, maybe part of the enjoyment of brewing is trying stuff out, even if it may not work. There are many ways to enjoy brewing, and you get to pick the one that satisfies you the most.
You just never know. That's the fun with experimenting.
