It depends in what you are referencing, are you talking about PCT or while your on cycle. If on cycle bro you wan to go with nolvadex first before aromasin, but if you are referencing to PCT as advised please read the link gearhead has posted.
You need to run an AI with your cycle (aromasin) to keep estrogen levels in the normal range and you need a proper PCT protocol after your cycle. Clomid alone isn't sufficient. Don't cut corners when it comes to your PCT. Not only is it extremely unhealthy, but you won't keep as much of the gains that you made on cycle that you could of otherwise.
Here's what I recommend:
Weeks 1 - 10
testosterone 500mg/week
aromasin 12.5mg every other day
@muskate has given you a very good layout here. Remember, proper PCT is vital, as without it you will lose your gains and your HPTA function will have a harder time recovering. Therefore, plan a good PCT, so that your cycle will not go in vain.
Arom on cycle and clomids after is fine. Liver guard is just milk thistle and similar ingredients. I just bought some at walgreens, hardly needed them. Best to invest in blood test instead and find out what your susceptible to rather than consume a bunch of precautionary pills/cream/oils.
My bloods revealed some high prostate while on cycle. This could be spiked by sex or masturbation but i went ahead and used saw palmetto for my pct. i had some minor irritation because of coming off test cycle so i added st johns wort which helped.