After my surgery it was found that half the nodes taken were cancerous !
I was told to keep my skin moisturised with cream,
always were a glove while gardening
Don't carry heavy items on that arm .
I always massage my arm and also raise it in the air to help with draining .
Go to a physio or occupational therapist. And check What's the best exercise for you is .. or check into you nearest Lymphodeama centre check on line !!
Also you can be measured by a professional for a Compression sleeve , a compression sleeve is like what burns victim wear ......... My arm was doing well till I started my radiation !! When it started filling with fluid .
I'm careful not to "hurt" it and I massage it myself and wear my sleeve some of the time .... but it's quite hot and I live in a hot country!
Don't worry too much , to just have to learn to live with and around it !! I work full time in a very physical and sometime dangerous area with no real issues !!
So talk to your GP Good luck.