first off, you sound like an 18 year old who just discovered steroids.
2nd, why don't you do some research? It's not hard to google ..
3rd, if you did do your research, you'd realize that most don't have erection problems.
I know i'm coming across like an ass, but most cycles - especially first time cycles are usually light. Meaning, you will probably want to run something like Eq, Test together and see how your body reacts. Deca can/will give most guys "deca dick" the inability to get it up during cycle. Most people who experience this problem are running large amounts of deca with something else that is highly anabolic.
If you are under the age of 23, you shouldn't even be juicing in the first place. And, most importantly, if you haven't been working out for atleast 5 years of good hard consistency, then don't even contemplate using gear.
And most importantly, if you don't have a source, you need to stick around here and READ, READ, READ!!. Do your research man and understand everything there is to know about steroids and then after you read, work out hard and then PLAN PLAN PLAN for your cycle. Once you have achieved this goal, you won't be asking questions and posting your email up wondering why everyone is treating you like an ignorant fool. Take my advice - take my constructive criticism and read some more before posting your questions. about 80% of your questions will be found by someone else asking the same ones.
And last , but not least, get a cyber-rights.net account or a hushmail account.
g'day