Hi, everybody! I have just taken my first lesson. It was [1] wonderful.  )

"Let's [2] gets together and feel all right."  [3] 
Ps. What about my present perfect?

[1]  Use the past simple, because you are describing something (a lesson) that began and ended in the past.

[2]  "Let's" is a contraction of "Let us".  Such contractions require an apostrophe (  '  ). 

[3]  Be careful not to confuse "fill" and "feel".  "all right" is standard English.  "alright" is a little sub-standard.