IMHO the two day on, one day off method works the best. Tapering up is ok, and NECESSARY for a first timer. this method allows you to use the active life of clen to keep your levels consistent.
Here is an example of a typical six week clen (42day) cycle and how I would suggest it for a first timer.
Listen to your body! dont be foolish and increase past your individual tolerance.
(just because a website or other person tells you there were fine at 200mcg doesnt mean your body will react the same)
after day 14 take day 15-28 off then repeat the cycle from day 29-42.
Remember Clen is used for fat loss and fat loss only. If you are not prepared to devote your lifestyle to maximize fat loss (in the healthiest possible way) you are not prepared for a cycle of clenbuterol. Fat loss and ONLY fat loss should be your ONLY concern when running clen. ONLY ONLY ONLY.
Just realized your only twenty... might want to hold off on the clen for a while... but if you insist then to answer your other question... YES there is be side effects from this drug like any other, but it is impossible to determine which ones your body will exhibit.