Set up basic environment of AWS without freetier

i am newbie to use AWS system. well, my freetier is just expired recently.

so far, i run an instance all day and use ssh to make code there. but now, i realized it could charge me more than i expected. so i decided to terminate the instance.

1. 
   

   then, how can i connect to instance easily? do i need to turn it on everytime i want to code?

   
   


2. 
   

   And which is better? whether using DynamicDB(in AWS) or make a separated instance and install linux and mongodb(or something else).

   
   

Thanks =)