我学中文很有意思。

you mean"i think learning chinese is very interesting",you should say "我觉得学中文很有意思"you forgot "think"

但我需要帮助。

this sentence is correct

我很高兴见到和聊天

maybe you want to say"nice to meet you, and i want to talk with you", you can say “很高兴认识你，我希望和你聊天"

keep practicing and you'll make great progress

大家好...

我觉得学中文很有意思，但我需要帮助。还有， 我很乐意和大家交朋友。

大家好...

我学认为中文很有意思。 但我需要大家的帮助。 我很高兴见到和大家聊天

Well, lots of foreigners say Chinese is so hard to learn. In my humble opinion, one of most difficult is that many west languages write in word by word and all Chinese words are written together in a sentence. So, sometimes, you can distict a Chinese word is sinlge or one of a phrase to its left one or right one.  How do think about that. 

大家好...

我认为学中文很有意思。 ，但（是）我需要（大家的）帮助。 我很高兴见到你们和与你们聊天。