How do I get to level 1 here on Steamgifts?

Giving away games is how you increase your level. L1 requires only a single game to successfully be given away.

FAQ

https://www.steamgifts.com/discussion/XaCbA/list-of-all-cv-levels-and-their-corresponding-real-cv

Games that have ever been bundled in the past or discounted 95% off or more (in any region compared to the US price after conversion) are considered bundled and only give you 15% of their retail value in contributor value here.

Edit: Also, if you search the discussions, you will find many other threads where people ask the same thing and there are more in depth answers about how the points work.

Use your starter sword and kill rabbits and chickens outside of town,
or make a giveaway for a game here on SG.

Welcome to SG

As others mentioned you giveaway games to level up. I want to point out that games that are free or involved in mass giveaways aren't allowed to be used. Using these can get you suspended/banned.