As Danksta said, for vet trials there are some requirements for trials.

For 99% of the rest of the content, however, it's up to you and how you like to play. For me, I don't consider my magplar healer, dps or tank. I carry around three configs for him and switch up depending on what I want to play. A year plus ago multi role play was a bit cumbersome with respecs, but experts like Alcast have started putting all Champion Points in the same lines across roles, and all attributes into the fighting resource. So by leveling up all abilities and carrying a couple sets, a character can flip roles easily.

You sound like maybe you're asking about some of the basics on weapon/armor/skill choices. Some broad tips:

- don't stress about setup too much. Right now focus on leveling skills and abilities and learning how they interact with one another. For example, have you learned which abilities offer major prophecy and major sorcery buffs, and are you using them? Those are the sort of concepts introduced around your level.

- while you can switch roles easily, it's hard to flip between stamina and magic. I'm going to assume you're building a magic Templar, which is essential for healer. If you're going with a hybrid approach and investing in both stamina and magic, you might want to rethink that. Hybrids kinda stink, and require an expert to make work. For newer players, commit to one or the other.

- as a magplar, for armor you want to level light AND heavy. You might even level all three lines as you work toward vet rank. Ultimately you'll likely be wearing a blend and spending on some passives in each line, especially if you flip between tanky and healer.

- a magic build should level both staff types and invest in all passives. Sword and shield is also useful for times when you want to be tanky. And some builds use dual wield because it gives you extra attack power. Note that a magic build won't invest in many passives or abilities in the sword lines...just a select few.

- there are some important skills and passives for magic toons in mages guild, level that.

- don't neglect legerdemain, ESPECIALLY if you want to pvp. There's a passive that reduced sneak cost, which is very helpful all over but essential for magic pvpers. Investing fully requires legerdemain 16...pick a route and every once in a while go steal 100-200 items. Fence anything with value, launder groceries and mats. I like the inn complex in orsinium...no npcs and 175 items per trip. Doing this every once in a while will get leger up in 10-15 trips.

- at level 30, you should be learning how gear set combos work. When you get to vet, a LOT of your power comes from using sets. Your character has 11 or 12 slots depending on weapon equipped. Vet configs maximize every slot. If you haven't transitioned to sets, now is a good time to learn the system. Julianos and Magnus Gift are two crafted sets that work great at lower levels and in vet...you might consider checking these out. Willows Path is also good for lower level play if you need regen, and especially in lower level pvp.