Can you help me build a team

You rolled a lot of Berserkers and Shuten. That's pretty nice for general farming.

You can punch quite a bit above your weight by relying on friend supports and bringing Servants who can keep those friend supports alive. In general, you want to at least level one Servant of each class so that you have a wide coverage of class advantage.

Now, my recommendation for you is to pay special care to Kintoki this event and to make sure that you permanently unlock him. Furthermore, you want to grab all of his event items and do at least 100 million damage during raids. This can be done by picking the right friend support for every raid for every Master.

Apart from Kintoki, I also recommend levelling Heracles and Shuten. Shuten's 5* powers will be highly effective on any rider map, but she's very powerful for this event as well. Heracles meanwhile is just a very nice battering ram for a lot of the current NA content. Ibaraki is great too though, so if you like her a bit more, she works just as well. Heracles is just a little more sturdy, which is helpful for new players.

Now, don't neglect your 3* Servants and Mash. Despite their rarity they often possess more power with class advantage than any of their gacha brethren.

Invest in:

-Mash
-David (ascend at least once, that team-wide dodge is great at keeping friend supports alive)
-Cu
-Hans (he's bronze, but he is amazing at supporting and keeping a team alive)

- Caesar is also pretty nifty for a Saber, but I recommend the above ones first.

That should give you one of each class. Once one Berserker is maxed out, start with the others. Don't neglect Servants that provide defense and support though, they're crucial for harder content.

For now, build a team around whatever friend support you are borrowing. Try and exploit class advantages whenever possible. For beginners, that's more important than team synergy.