Wood isn't going to do much on horde night, fencing either. Depending on how you set up the spikes, the zombies might just path around them. Digging a one block trench and putting the spikes in there (so their top is flush with the terrain) supposedly works, but honestly I don't even bother with them. The best way to avoid dying on early horde nights (without avoiding them completely) is to create high ground that the zombies can't get to. Either the roof of an existing building (destroy the stairs), or a platform you built yourself (preferably made out of cobblestone over wood). Make sure there's plenty of support (they will start knocking out pillars) and that there are NO paths to you that require less than two blocks of jump height, ladders and small blocks like furniture etc. included. Otherwise the zombies will find that path and swarm you easily. Unfortunately they're much "smarter" than you'd expect zombies to be based on popular culture, and can find weak points n your structure easily, and this won't be readily apparent to new players.
Having fall back options is helpful, as is a way to get back on your platform if you fall off. Zombies can climb ladders, but they won't jump on them if they're two blocks from the ground, while the player can still reach that (if their leg ain't broken

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Early weapons that work well on horde night are bows, blunderbusses and Molotov cocktails or pipe bombs. Of course guns do the trick as well if you manage to find them and their ammo.
As for perks to invest in early on: strength has a lot of stuff that will help you survive, from heavy armor to stamina management and cooking (you can't even make bacon & eggs without finding the recipe). A point in Advanced Engineering (under Intelligence) can help you get a forge and iron tools/armor a little quicker, but depending on what kind of stuff you loot you might not really need it yet. Intelligence also has Grease Monkey, which lets you make a bike and speed up the things you can do in a day significantly.
Early on you should be able to make do with simple items and a skill point invested here and there, specialization only becomes somewhat important during mid- to late game.
Good luck & have fun!