Sure, start the clen if you really want to get started and have enough. Be careful with the T3 though, I wouldn't run more that 25mcg without test and start lower than that and work up. As far as Clen doses go, look at my Clen suggestion at the bottom. As far as the T3 goes, I usually stick to 50mcg per day tapered up over a few days and tapered down over a week or so. 25mcg is a full-replacement dose as far as I know. I personally notice a hugh difference with 50mcg and not much more with higher doses - if I was to make a generic chart as far as fat loss goes it would be:
00 Cytomel = 1lb fatloss /week
25 Cytomel = 2lb fatloss /week
50 Cytomel = 3lb fatloss /week
100 Cytomel = 3.4lb fatloss /week
150 Cytomel= 3.5lb fatloss /week
This is totally arbitary, but it shows my point as far as I go, anything above 50-75mcg for me causes more sides than fat loss.
Also as far as the Clen goes two ways to run it:
1) Run it for 2on/2off (you can ramp the doses higher - 40,80,120,140,160,180,180,180,180,180,160,140,120,60 (notice the bigger steps at the beginner of +40 per day, and later +20 per day, that is to adjust according to tolerace, Clen as a long half life, but should still be tapered, but can rather quickly. DO NOT RUN ECA ON OFF WEEKS! They both are beta-2 antagonist, eca is just not as strong.
2) Run it up to 12 weeks, don't go above 100-125mcg of clen until several weeks have past; I'd go 20, 40, 60, 60, 80, 80, 100 the first week and stay at 100mcg for a week or so unless you aren't feeling it good. It's real easy with Clen to ramp up to high/too quick. Take Ketotifen at 1-3mg/day or even better in my opinion is to use Benadryl 2-3 nights a week at 50-100mg - they both will help restore/maintain your receptors and keep them/repair them from methylizing. Ketoifen is pretty strong and is best used post-cycle as it helps with TNF levels. Otherwise use Benadryl as it is easier on you and cheaper. I use it sunday/monday night to help me get to bed early for the work week starting again and usually thursday as well because of my schedule - the benadryl and ketotifen will both make you drowsy and sleep easier, and by using either one you can run your clen or eca or albuterol or whatever beta-2 antaganists for much longer without losing it's effect. I use another fat burner, caffiene, and/or Modafinal when I come off to help keep me from being to tired with benadryl or ketotifen for 3-5 days to help with any beta-2 methylization recovery that still might be present. The old school way to do it was to up the dose as sensitivity waned, using benadryl/ketotifen allows lower doses and for a much longer time.