Summerhouse on patio with fall

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Hi all, been trying to read previous posts.
I have a 3x3 patio that's on a slight slope and will be building a corner summerhouse on it next week hopefully.
To keep the bearers level is it ok to use plastic shims?
Should I also use a DPC roll on top of the bearers between them and the summerhouse?

Regarding the roof it comes with felt and also shingles is it also worth fitting an underlay for extra protection?
It also looks like there are no air gaps round the base, is this required?
Thanks.
 
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