Hey brother, all sort of issues with this plan. Lets start from the top. 

You need test as your base. Deca will shut you down. Your test levels will drop rapidly as the deca kicks in and you will feel like garbage. I would suggest finding out how you respond to test before adding in other compounds. Then from there, in your second cycle, add some dea if you like. Thats just my suggestion. If you are going to riun deca though, do it with test. 

Next, deca is a very long estered drug. It takes severa weeks for it to build up and begin showing strong effects. For the reason, your test/deca cycle should be at least 10 wks if not longer. 

And last, get yourself some PCT to run after this cycle is done. A couple packs of Clomid would be a good start. And for on cycle support, pick up some adex to control estrogen 

Dosing on this cycle might look like this for a newbie, first time user :

1-12

Test E 375-500mg EW

adex .5mg EOD

1-10

Deca 300-400mg Ew

PCT starts 2 wks after last shot. 100mg Clomid for 7 days. Then 14-21 days at 50mg ED