You'll want to start stacking up on resistances, base damage, and resource regeneration first. You have very little CP, so you shouldn't worry too much about this yet. However, you can start early by asking yourself now... do I want to be a damage dealer, tank, or healer?

For the blue area:

In general, if you are primarily magicka-based, you'll want to first invest in Elemental Expert in the Apprentice. If you're a stamina user, you'll go for Mighty in the RItual. You want to invest the most into one of these pools because they can help your damage a lot and help you face content easier. Later, you can graduate to the crit damage buffs and increased penetration.

For the green area:

Start with Warlord if you're stamina-based or Magician if you're magicka-based (in the Tower). When you start having more CP to spend, you'll want to also invest in Mooncalf if you're stamina or Arcanist if magicka (in the Lover). You'll often want to invest more in those two Tower trees later on. You may also want to consider Tumbling / Shadow Ward in the Shadow.

For the red area:

Split between Hardy and Elemental Defender in the Lady tree. Eventually, you'll also want some Thick-skinned in there, but it'll mostly be those two. Quick Recovery in the Lord and Resistant in the Steed (only for PvP though) can help you in later CP levels.

Once you reach somewhere around your level, you'll want to look into builds online. Once you've done the research, you can decide for yourself what role you want (if you know this already). However, for now, the ones I mentioned should help you decently until you get higher CP.