So i decided I am going to give hardcoe a shot and as well as start using Survival and campfires. I wanted to know what are the plants and items I should be looking out for that I could use to make the best food, medicine, etc out in the wasteland.
Get your Survival skill up to at least 25 ASAP as that will allow you to make Gecko steaks, you can survive on them and only them for the rest of the game really. More skill points into Survival after that is mostly a matter of taste, as you can use Medicine for healing via stimpacks instead although some of the bonuses like a Bighorner steak's (50 Survival required) +1/+2 to Strength is nice to have when you need to carry a lot of loot around to a merchant. I took Survival up into the 90s on one character and you can heal a ton of damage from eating a simple Gecko steak at those levels but to be honest it was kinda excessive and a waste. Beyond 50 I don't see much point in adding more skill points.
Lock picking and Hacking: I didn't find lock picking to be that useful in New Vegas but maybe I am wrong. I only raised it to 100 in order to get the Gobi which wasn't that much of a big deal. I never liked Hacking since I found it to be a pain but I am thinking of giving it a try. Is there a certain level that I should reach for these or maybe stick to one?
If you're a explorer type of person who wanders around the Wasteland just to see what quests and dungeons/caves you can find you'll use Lockpick FAR more often than Science in regards to unlocking things. I had a better than 10:1 ratio on my skill usage for most of my game when I played such a character, as there just aren't anywhere near as many active terminals as compared to physically locked things.
The caveat is if you're planing to use Energy Weapons, as in that case a high Science is a recommended for the ammo crafting/conversion/recycling that goes along with it. For skill levels, get Lockpick up to at least 75 ASAP as that will get you into most of the locked things in the game as there aren't many Very Hard locks around. Get Science up to at least 50 I'd say and higher if using Energy Weapons, after those levels are reached it's again personal preference. Science is used in crafting when it comes to many of the better Chem and Aid items as well btw if you care about that aspect of the game, I don't use them much myself.
Speech and Barter: I see barter has a little of two worlds in this Fallout. Convincing people as much as speech as well as better prices at merchants and such. Which one has more of an effect in the game?
I did a little research and it seems people are saying speech owns this game but I do not see why.
Speech is used far more often than Barter and to greater effect in almost every quest. Not to say Barter isn't used often as it certainly is, just that it's about demanding higher rewards in caps or equipment for the most part. Nothing wrong with that, just be aware that money shouldn't be much of an issue in this game past the mid-teen levels.
Any other Hints and Tips for a Guns/Sniper build will be highly appreciated.
There are numerous threads in this forum and in General regarding making a Guns Sniper character, peruse them to get some ideas on SPECIAL stats and skill and perk choices. It's one of the most popular and easiest character builds going around these days.
Hope this helped you out, good luck.